131634020521 has 4 divisors (see below), whose sum is σ = 131735045632. Its totient is φ = 131532995412.

The previous prime is 131634020489. The next prime is 131634020549. The reversal of 131634020521 is 125020436131.

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 a cyclic number.

It is not a de Polignac number, because 131634020521 - 2⁵ = 131634020489 is a prime.

It is a super-2 number, since 2×131634020521² (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 131634020521.

It is not an unprimeable number, because it can be changed into a prime (131634020561) 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, 50510601 + ... + 50513206.

It is an arithmetic number, because the mean of its divisors is an integer number (32933761408).

Almost surely, 2^131634020521 is an apocalyptic number.

It is an amenable number.

131634020521 is a deficient number, since it is larger than the sum of its proper divisors (101025111).

131634020521 is a wasteful number, since it uses less digits than its factorization.

131634020521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101025110.

The product of its (nonzero) digits is 4320, while the sum is 28.

Adding to 131634020521 its reverse (125020436131), we get a palindrome (256654456652).

The spelling of 131634020521 in words is "one hundred thirty-one billion, six hundred thirty-four million, twenty thousand, five hundred twenty-one".