31356155481 has 16 divisors (see below), whose sum is σ = 47789779968. Its totient is φ = 17914438800.

The previous prime is 31356155473. The next prime is 31356155491. The reversal of 31356155481 is 18455165313.

It is not a de Polignac number, because 31356155481 - 2³ = 31356155473 is a prime.

It is a super-2 number, since 2×31356155481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31356155491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23415 + ... + 251516.

It is an arithmetic number, because the mean of its divisors is an integer number (2986861248).

Almost surely, 2^31356155481 is an apocalyptic number.

It is an amenable number.

31356155481 is a deficient number, since it is larger than the sum of its proper divisors (16433624487).

31356155481 is a wasteful number, since it uses less digits than its factorization.

31356155481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280372.

The product of its digits is 216000, while the sum is 42.

The spelling of 31356155481 in words is "thirty-one billion, three hundred fifty-six million, one hundred fifty-five thousand, four hundred eighty-one".