131228778093169 has 3 divisors (see below), whose sum is σ = 131228789548683. Its totient is φ = 131228766637656.

The previous prime is 131228778093113. The next prime is 131228778093199. The reversal of 131228778093169 is 961390877822131.

The square root of 131228778093169 is 11455513.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 66640038322225 + 64588739770944 = 8163335^2 + 8036712^2 .

It is a de Polignac number, because none of the positive numbers 2^k-131228778093169 is a prime.

It is a super-2 number, since 2×131228778093169² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131228778093199) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5727757 + ... + 17183269.

It is an arithmetic number, because the mean of its divisors is an integer number (43742929849561).

Almost surely, 2^{131228778093169} is an apocalyptic number.

131228778093169 is the 11455513-rd square number.

131228778093169 is the 5727757-th centered octagonal number.

It is an amenable number.

131228778093169 is a deficient number, since it is larger than the sum of its proper divisors (11455514).

131228778093169 is an frugal number, since it uses more digits than its factorization.

131228778093169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22911026 (or 11455513 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 67.

The spelling of 131228778093169 in words is "one hundred thirty-one trillion, two hundred twenty-eight billion, seven hundred seventy-eight million, ninety-three thousand, one hundred sixty-nine".