55142691 has 16 divisors (see below), whose sum is σ = 75843744. Its totient is φ = 35610624.

The previous prime is 55142687. The next prime is 55142699. The reversal of 55142691 is 19624155.

It is not a de Polignac number, because 55142691 - 2² = 55142687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55142699) 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, 27561 + ... + 29493.

It is an arithmetic number, because the mean of its divisors is an integer number (4740234).

Almost surely, 2^55142691 is an apocalyptic number.

55142691 is a deficient number, since it is larger than the sum of its proper divisors (20701053).

55142691 is a wasteful number, since it uses less digits than its factorization.

55142691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230.

The product of its digits is 10800, while the sum is 33.

The square root of 55142691 is about 7425.8124807997. The cubic root of 55142691 is about 380.6238390985.

The spelling of 55142691 in words is "fifty-five million, one hundred forty-two thousand, six hundred ninety-one".