31240420311 has 16 divisors (see below), whose sum is σ = 45179836128. Its totient is φ = 19123737600.

The previous prime is 31240420307. The next prime is 31240420327. The reversal of 31240420311 is 11302404213.

It is not a de Polignac number, because 31240420311 - 2² = 31240420307 is a prime.

It is a super-2 number, since 2×31240420311² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240420301) 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, 7468120 + ... + 7472301.

It is an arithmetic number, because the mean of its divisors is an integer number (2823739758).

Almost surely, 2^31240420311 is an apocalyptic number.

31240420311 is a deficient number, since it is larger than the sum of its proper divisors (13939415817).

31240420311 is a wasteful number, since it uses less digits than its factorization.

31240420311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14940482.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 31240420311 its reverse (11302404213), we get a palindrome (42542824524).

The spelling of 31240420311 in words is "thirty-one billion, two hundred forty million, four hundred twenty thousand, three hundred eleven".