31505042051 has 24 divisors (see below), whose sum is σ = 38614383360. Its totient is φ = 25131930912.

The previous prime is 31505042027. The next prime is 31505042099. The reversal of 31505042051 is 15024050513.

It is not a de Polignac number, because 31505042051 - 2¹⁸ = 31504779907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31505042051.

It is not an unprimeable number, because it can be changed into a prime (31505042251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 148940 + ... + 291878.

It is an arithmetic number, because the mean of its divisors is an integer number (1608932640).

Almost surely, 2^31505042051 is an apocalyptic number.

31505042051 is a deficient number, since it is larger than the sum of its proper divisors (7109341309).

31505042051 is a wasteful number, since it uses less digits than its factorization.

31505042051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143043 (or 143006 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

Adding to 31505042051 its reverse (15024050513), we get a palindrome (46529092564).

The spelling of 31505042051 in words is "thirty-one billion, five hundred five million, forty-two thousand, fifty-one".