31514732651021 has 4 divisors (see below), whose sum is σ = 31515547676700. Its totient is φ = 31513917625344.

The previous prime is 31514732651011. The next prime is 31514732651041. The reversal of 31514732651021 is 12015623741513.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3038795049796 + 28475937601225 = 1743214^2 + 5336285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31514732651021 is a prime.

It is a super-3 number, since 3×31514732651021³ (a number of 41 digits) contains 333 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 31514732651021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31514732651011) 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, 407454836 + ... + 407532173.

It is an arithmetic number, because the mean of its divisors is an integer number (7878886919175).

Almost surely, 2^{31514732651021} is an apocalyptic number.

It is an amenable number.

31514732651021 is a deficient number, since it is larger than the sum of its proper divisors (815025679).

31514732651021 is an equidigital number, since it uses as much as digits as its factorization.

31514732651021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815025678.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 31514732651021 in words is "thirty-one trillion, five hundred fourteen billion, seven hundred thirty-two million, six hundred fifty-one thousand, twenty-one".