55620871 has 2 divisors, whose sum is σ = 55620872. Its totient is φ = 55620870.

The previous prime is 55620857. The next prime is 55620899. The reversal of 55620871 is 17802655.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55620871 - 2⁷ = 55620743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55620841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27810435 + 27810436.

It is an arithmetic number, because the mean of its divisors is an integer number (27810436).

Almost surely, 2^55620871 is an apocalyptic number.

55620871 is a deficient number, since it is larger than the sum of its proper divisors (1).

55620871 is an equidigital number, since it uses as much as digits as its factorization.

55620871 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 55620871 is about 7457.9401311622. The cubic root of 55620871 is about 381.7208906600.

The spelling of 55620871 in words is "fifty-five million, six hundred twenty thousand, eight hundred seventy-one".