31423536081 has 12 divisors (see below), whose sum is σ = 51873773952. Its totient is φ = 17956306296.

The previous prime is 31423536073. The next prime is 31423536091. The reversal of 31423536081 is 18063532413.

31423536081 is a `hidden beast` number, since 3 + 1 + 42 + 3 + 5 + 3 + 608 + 1 = 666.

It is not a de Polignac number, because 31423536081 - 2³ = 31423536073 is a prime.

It is a super-2 number, since 2×31423536081² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31423536091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 249393081 + ... + 249393206.

It is an arithmetic number, because the mean of its divisors is an integer number (4322814496).

Almost surely, 2^31423536081 is an apocalyptic number.

It is an amenable number.

31423536081 is a deficient number, since it is larger than the sum of its proper divisors (20450237871).

31423536081 is a wasteful number, since it uses less digits than its factorization.

31423536081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498786300 (or 498786297 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The spelling of 31423536081 in words is "thirty-one billion, four hundred twenty-three million, five hundred thirty-six thousand, eighty-one".