31521413412551 has 4 divisors (see below), whose sum is σ = 31681420587432. Its totient is φ = 31361406237672.

The previous prime is 31521413412497. The next prime is 31521413412589. The reversal of 31521413412551 is 15521431412513.

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

It is a cyclic number.

It is not a de Polignac number, because 31521413412551 - 2³⁰ = 31520339670727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31521413415551) 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, 80003587145 + ... + 80003587538.

It is an arithmetic number, because the mean of its divisors is an integer number (7920355146858).

Almost surely, 2^{31521413412551} is an apocalyptic number.

31521413412551 is a deficient number, since it is larger than the sum of its proper divisors (160007174881).

31521413412551 is a wasteful number, since it uses less digits than its factorization.

31521413412551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160007174880.

The product of its digits is 72000, while the sum is 38.

The spelling of 31521413412551 in words is "thirty-one trillion, five hundred twenty-one billion, four hundred thirteen million, four hundred twelve thousand, five hundred fifty-one".