31504442120145 has 64 divisors (see below), whose sum is σ = 56463767712000. Its totient is φ = 16666158348288.

The previous prime is 31504442120093. The next prime is 31504442120153. The reversal of 31504442120145 is 54102124440513.

31504442120145 is a `hidden beast` number, since 3 + 1 + 5 + 0 + 4 + 442 + 1 + 201 + 4 + 5 = 666.

It is not a de Polignac number, because 31504442120145 - 2⁸ = 31504442119889 is a prime.

It is a super-2 number, since 2×31504442120145² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6332641 + ... + 10154369.

It is an arithmetic number, because the mean of its divisors is an integer number (882246370500).

Almost surely, 2^{31504442120145} is an apocalyptic number.

It is an amenable number.

31504442120145 is a deficient number, since it is larger than the sum of its proper divisors (24959325591855).

31504442120145 is a wasteful number, since it uses less digits than its factorization.

31504442120145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3822239 (or 3822233 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

Adding to 31504442120145 its reverse (54102124440513), we get a palindrome (85606566560658).

The spelling of 31504442120145 in words is "thirty-one trillion, five hundred four billion, four hundred forty-two million, one hundred twenty thousand, one hundred forty-five".