131615391801 has 4 divisors (see below), whose sum is σ = 175487189072. Its totient is φ = 87743594532.

The previous prime is 131615391799. The next prime is 131615391821. The reversal of 131615391801 is 108193516131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 131615391801 - 2¹ = 131615391799 is a prime.

It is a super-2 number, since 2×131615391801² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131615391801.

It is not an unprimeable number, because it can be changed into a prime (131615391821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21935898631 + ... + 21935898636.

It is an arithmetic number, because the mean of its divisors is an integer number (43871797268).

Almost surely, 2^131615391801 is an apocalyptic number.

It is an amenable number.

131615391801 is a deficient number, since it is larger than the sum of its proper divisors (43871797271).

131615391801 is an equidigital number, since it uses as much as digits as its factorization.

131615391801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43871797270.

The product of its (nonzero) digits is 19440, while the sum is 39.

The spelling of 131615391801 in words is "one hundred thirty-one billion, six hundred fifteen million, three hundred ninety-one thousand, eight hundred one".