56767621 has 2 divisors, whose sum is σ = 56767622. Its totient is φ = 56767620.

The previous prime is 56767619. The next prime is 56767631. The reversal of 56767621 is 12676765.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31516996 + 25250625 = 5614^2 + 5025^2 .

It is a cyclic number.

It is not a de Polignac number, because 56767621 - 2¹ = 56767619 is a prime.

Together with 56767619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56767631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28383810 + 28383811.

It is an arithmetic number, because the mean of its divisors is an integer number (28383811).

Almost surely, 2^56767621 is an apocalyptic number.

It is an amenable number.

56767621 is a deficient number, since it is larger than the sum of its proper divisors (1).

56767621 is an equidigital number, since it uses as much as digits as its factorization.

56767621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 105840, while the sum is 40.

The square root of 56767621 is about 7534.4290427344. The cubic root of 56767621 is about 384.3264120045.

The spelling of 56767621 in words is "fifty-six million, seven hundred sixty-seven thousand, six hundred twenty-one".