55601691 has 16 divisors (see below), whose sum is σ = 75487104. Its totient is φ = 36396864.

The previous prime is 55601669. The next prime is 55601737. The reversal of 55601691 is 19610655.

It is a de Polignac number, because none of the positive numbers 2^k-55601691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55601191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66820 + ... + 67646.

It is an arithmetic number, because the mean of its divisors is an integer number (4717944).

Almost surely, 2^55601691 is an apocalyptic number.

55601691 is a deficient number, since it is larger than the sum of its proper divisors (19885413).

55601691 is a wasteful number, since it uses less digits than its factorization.

55601691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 55601691 is about 7456.6541424422. The cubic root of 55601691 is about 381.6770087606.

The spelling of 55601691 in words is "fifty-five million, six hundred one thousand, six hundred ninety-one".