131520662437 has 4 divisors (see below), whose sum is σ = 131536274220. Its totient is φ = 131505050656.

The previous prime is 131520662431. The next prime is 131520662443. The reversal of 131520662437 is 734266025131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (131520662431) and next prime (131520662443).

It can be written as a sum of positive squares in 2 ways, for example, as 19963994436 + 111556668001 = 141294^2 + 334001^2 .

It is a cyclic number.

It is not a de Polignac number, because 131520662437 - 2⁷ = 131520662309 is a prime.

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 131520662437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131520662431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7793248 + ... + 7810105.

It is an arithmetic number, because the mean of its divisors is an integer number (32884068555).

Almost surely, 2^131520662437 is an apocalyptic number.

It is an amenable number.

131520662437 is a deficient number, since it is larger than the sum of its proper divisors (15611783).

131520662437 is an equidigital number, since it uses as much as digits as its factorization.

131520662437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15611782.

The product of its (nonzero) digits is 181440, while the sum is 40.

Adding to 131520662437 its reverse (734266025131), we get a palindrome (865786687568).

The spelling of 131520662437 in words is "one hundred thirty-one billion, five hundred twenty million, six hundred sixty-two thousand, four hundred thirty-seven".