55891643 has 2 divisors, whose sum is σ = 55891644. Its totient is φ = 55891642.

The previous prime is 55891639. The next prime is 55891669. The reversal of 55891643 is 34619855.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55891643 - 2² = 55891639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55891643.

It is not a weakly prime, because it can be changed into another prime (55891943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27945821 + 27945822.

It is an arithmetic number, because the mean of its divisors is an integer number (27945822).

Almost surely, 2^55891643 is an apocalyptic number.

55891643 is a deficient number, since it is larger than the sum of its proper divisors (1).

55891643 is an equidigital number, since it uses as much as digits as its factorization.

55891643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 41.

The square root of 55891643 is about 7476.0713613502. The cubic root of 55891643 is about 382.3393159359.

The spelling of 55891643 in words is "fifty-five million, eight hundred ninety-one thousand, six hundred forty-three".