55801901 has 2 divisors, whose sum is σ = 55801902. Its totient is φ = 55801900.

The previous prime is 55801877. The next prime is 55801937. The reversal of 55801901 is 10910855.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42588676 + 13213225 = 6526^2 + 3635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55801901 is a prime.

It is a super-2 number, since 2×55801901² = 6227704310427602, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55801001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27900950 + 27900951.

It is an arithmetic number, because the mean of its divisors is an integer number (27900951).

Almost surely, 2^55801901 is an apocalyptic number.

It is an amenable number.

55801901 is a deficient number, since it is larger than the sum of its proper divisors (1).

55801901 is an equidigital number, since it uses as much as digits as its factorization.

55801901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 55801901 is about 7470.0670010382. The cubic root of 55801901 is about 382.1345728910.

The spelling of 55801901 in words is "fifty-five million, eight hundred one thousand, nine hundred one".