31400436465 has 24 divisors (see below), whose sum is σ = 55898437608. Its totient is φ = 16294279680.

The previous prime is 31400436451. The next prime is 31400436467. The reversal of 31400436465 is 56463400413.

31400436465 is a `hidden beast` number, since 3 + 1 + 4 + 0 + 0 + 4 + 3 + 646 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2929948641 + 28470487824 = 54129^2 + 168732^2 .

It is not a de Polignac number, because 31400436465 - 2⁹ = 31400435953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31400436467) 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, 9427896 + ... + 9431225.

It is an arithmetic number, because the mean of its divisors is an integer number (2329101567).

Almost surely, 2^31400436465 is an apocalyptic number.

It is an amenable number.

31400436465 is a deficient number, since it is larger than the sum of its proper divisors (24498001143).

31400436465 is a wasteful number, since it uses less digits than its factorization.

31400436465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18859169 (or 18859166 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

Adding to 31400436465 its reverse (56463400413), we get a palindrome (87863836878).

The spelling of 31400436465 in words is "thirty-one billion, four hundred million, four hundred thirty-six thousand, four hundred sixty-five".