56431511 has 2 divisors, whose sum is σ = 56431512. Its totient is φ = 56431510.

The previous prime is 56431499. The next prime is 56431513. The reversal of 56431511 is 11513465.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56431511 - 2¹⁰ = 56430487 is a prime.

Together with 56431513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56431513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28215755 + 28215756.

It is an arithmetic number, because the mean of its divisors is an integer number (28215756).

Almost surely, 2^56431511 is an apocalyptic number.

56431511 is a deficient number, since it is larger than the sum of its proper divisors (1).

56431511 is an equidigital number, since it uses as much as digits as its factorization.

56431511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 26.

The square root of 56431511 is about 7512.0909872019. The cubic root of 56431511 is about 383.5664028547.

Adding to 56431511 its reverse (11513465), we get a palindrome (67944976).

The spelling of 56431511 in words is "fifty-six million, four hundred thirty-one thousand, five hundred eleven".