131198257369 has 3 divisors (see below), whose sum is σ = 131198619583. Its totient is φ = 131197895156.

The previous prime is 131198257349. The next prime is 131198257391. The reversal of 131198257369 is 963752891131.

The square root of 131198257369 is 362213.

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., 162945225 + 131035312144 = 12765^2 + 361988^2 .

It is not a de Polignac number, because 131198257369 - 2¹⁹ = 131197733081 is a prime.

It is a super-2 number, since 2×131198257369² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131198257349) 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, 181107 + ... + 543319.

Almost surely, 2^131198257369 is an apocalyptic number.

131198257369 is the 362213-rd square number.

131198257369 is the 181107-th centered octagonal number.

It is an amenable number.

131198257369 is a deficient number, since it is larger than the sum of its proper divisors (362214).

131198257369 is an frugal number, since it uses more digits than its factorization.

131198257369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724426 (or 362213 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 55.

The spelling of 131198257369 in words is "one hundred thirty-one billion, one hundred ninety-eight million, two hundred fifty-seven thousand, three hundred sixty-nine".