3131516456645 has 4 divisors (see below), whose sum is σ = 3757819747980. Its totient is φ = 2505213165312.

The previous prime is 3131516456573. The next prime is 3131516456657. The reversal of 3131516456645 is 5466546151313.

It is a happy number.

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 497721784036 + 2633794672609 = 705494^2 + 1622897^2 .

It is a cyclic number.

It is not a de Polignac number, because 3131516456645 - 2³⁸ = 2856638549701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3131516456593 and 3131516456602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313151645660 + ... + 313151645669.

It is an arithmetic number, because the mean of its divisors is an integer number (939454936995).

Almost surely, 2^{3131516456645} is an apocalyptic number.

It is an amenable number.

3131516456645 is a deficient number, since it is larger than the sum of its proper divisors (626303291335).

3131516456645 is an equidigital number, since it uses as much as digits as its factorization.

3131516456645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626303291334.

The product of its digits is 3888000, while the sum is 50.

The spelling of 3131516456645 in words is "three trillion, one hundred thirty-one billion, five hundred sixteen million, four hundred fifty-six thousand, six hundred forty-five".