56751551 has 2 divisors, whose sum is σ = 56751552. Its totient is φ = 56751550.

The previous prime is 56751517. The next prime is 56751619. The reversal of 56751551 is 15515765.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56751551 - 2¹⁰ = 56750527 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56751251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28375775 + 28375776.

It is an arithmetic number, because the mean of its divisors is an integer number (28375776).

Almost surely, 2^56751551 is an apocalyptic number.

56751551 is a deficient number, since it is larger than the sum of its proper divisors (1).

56751551 is an equidigital number, since it uses as much as digits as its factorization.

56751551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26250, while the sum is 35.

The square root of 56751551 is about 7533.3625294419. The cubic root of 56751551 is about 384.2901430410.

The spelling of 56751551 in words is "fifty-six million, seven hundred fifty-one thousand, five hundred fifty-one".