31005215364 has 12 divisors (see below), whose sum is σ = 72345502544. Its totient is φ = 10335071784.

The previous prime is 31005215357. The next prime is 31005215369. The reversal of 31005215364 is 46351250013.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×31005215364² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31005215369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1291883962 + ... + 1291883985.

Almost surely, 2^31005215364 is an apocalyptic number.

It is an amenable number.

31005215364 is an abundant number, since it is smaller than the sum of its proper divisors (41340287180).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31005215364 is a wasteful number, since it uses less digits than its factorization.

31005215364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2583767954 (or 2583767952 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 31005215364 its reverse (46351250013), we get a palindrome (77356465377).

The spelling of 31005215364 in words is "thirty-one billion, five million, two hundred fifteen thousand, three hundred sixty-four".