55620401 has 2 divisors, whose sum is σ = 55620402. Its totient is φ = 55620400.

The previous prime is 55620377. The next prime is 55620407. The reversal of 55620401 is 10402655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55056400 + 564001 = 7420^2 + 751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55620401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55620407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27810200 + 27810201.

It is an arithmetic number, because the mean of its divisors is an integer number (27810201).

Almost surely, 2^55620401 is an apocalyptic number.

It is an amenable number.

55620401 is a deficient number, since it is larger than the sum of its proper divisors (1).

55620401 is an equidigital number, since it uses as much as digits as its factorization.

55620401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 55620401 is about 7457.9086210546. The cubic root of 55620401 is about 381.7198154682.

The spelling of 55620401 in words is "fifty-five million, six hundred twenty thousand, four hundred one".