31140423140 has 24 divisors (see below), whose sum is σ = 66466938552. Its totient is φ = 12251969280.

The previous prime is 31140423113. The next prime is 31140423157. The reversal of 31140423140 is 4132404113.

It can be written as a sum of positive squares in 4 ways, for example, as 1072169536 + 30068253604 = 32744^2 + 173402^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12761249 + ... + 12763688.

It is an arithmetic number, because the mean of its divisors is an integer number (2769455773).

Almost surely, 2^31140423140 is an apocalyptic number.

It is an amenable number.

31140423140 is an abundant number, since it is smaller than the sum of its proper divisors (35326515412).

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

31140423140 is a wasteful number, since it uses less digits than its factorization.

31140423140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25525007 (or 25525005 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 31140423140 its reverse (4132404113), we get a palindrome (35272827253).

The spelling of 31140423140 in words is "thirty-one billion, one hundred forty million, four hundred twenty-three thousand, one hundred forty".