56421901 has 2 divisors, whose sum is σ = 56421902. Its totient is φ = 56421900.

The previous prime is 56421851. The next prime is 56421913. The reversal of 56421901 is 10912465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54022500 + 2399401 = 7350^2 + 1549^2 .

It is a cyclic number.

It is not a de Polignac number, because 56421901 - 2⁹ = 56421389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56421901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56421941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28210950 + 28210951.

It is an arithmetic number, because the mean of its divisors is an integer number (28210951).

Almost surely, 2^56421901 is an apocalyptic number.

It is an amenable number.

56421901 is a deficient number, since it is larger than the sum of its proper divisors (1).

56421901 is an equidigital number, since it uses as much as digits as its factorization.

56421901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 56421901 is about 7511.4513244778. The cubic root of 56421901 is about 383.5446284813.

The spelling of 56421901 in words is "fifty-six million, four hundred twenty-one thousand, nine hundred one".