55911691 has 8 divisors (see below), whose sum is σ = 64582704. Its totient is φ = 47838720.

The previous prime is 55911679. The next prime is 55911703. The reversal of 55911691 is 19611955.

It is an interprime number because it is at equal distance from previous prime (55911679) and next prime (55911703).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55911691 - 2⁹ = 55911179 is a prime.

It is a super-2 number, since 2×55911691² = 6252234380958962, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55911691.

It is not an unprimeable number, because it can be changed into a prime (55911641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149310 + ... + 149683.

It is an arithmetic number, because the mean of its divisors is an integer number (8072838).

Almost surely, 2^55911691 is an apocalyptic number.

55911691 is a deficient number, since it is larger than the sum of its proper divisors (8671013).

55911691 is a wasteful number, since it uses less digits than its factorization.

55911691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299021.

The product of its digits is 12150, while the sum is 37.

The square root of 55911691 is about 7477.4120523079. The cubic root of 55911691 is about 382.3850247509.

The spelling of 55911691 in words is "fifty-five million, nine hundred eleven thousand, six hundred ninety-one".