56921911 has 2 divisors, whose sum is σ = 56921912. Its totient is φ = 56921910.

The previous prime is 56921897. The next prime is 56921923. The reversal of 56921911 is 11912965.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56921911 - 2¹³ = 56913719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56921951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28460955 + 28460956.

It is an arithmetic number, because the mean of its divisors is an integer number (28460956).

Almost surely, 2^56921911 is an apocalyptic number.

56921911 is a deficient number, since it is larger than the sum of its proper divisors (1).

56921911 is an equidigital number, since it uses as much as digits as its factorization.

56921911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 34.

The square root of 56921911 is about 7544.6610924547. The cubic root of 56921911 is about 384.6742868425.

The spelling of 56921911 in words is "fifty-six million, nine hundred twenty-one thousand, nine hundred eleven".