55651571 has 2 divisors, whose sum is σ = 55651572. Its totient is φ = 55651570.

The previous prime is 55651553. The next prime is 55651601. The reversal of 55651571 is 17515655.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55651571 is a prime.

It is not a weakly prime, because it can be changed into another prime (55656571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27825785 + 27825786.

It is an arithmetic number, because the mean of its divisors is an integer number (27825786).

Almost surely, 2^55651571 is an apocalyptic number.

55651571 is a deficient number, since it is larger than the sum of its proper divisors (1).

55651571 is an equidigital number, since it uses as much as digits as its factorization.

55651571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26250, while the sum is 35.

The square root of 55651571 is about 7459.9980563000. The cubic root of 55651571 is about 381.7911081624.

The spelling of 55651571 in words is "fifty-five million, six hundred fifty-one thousand, five hundred seventy-one".