55523691 has 16 divisors (see below), whose sum is σ = 83030400. Its totient is φ = 36667944.

The previous prime is 55523687. The next prime is 55523729. The reversal of 55523691 is 19632555.

It is not a de Polignac number, because 55523691 - 2² = 55523687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55523641) 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, 6721 + ... + 12498.

It is an arithmetic number, because the mean of its divisors is an integer number (5189400).

Almost surely, 2^55523691 is an apocalyptic number.

55523691 is a deficient number, since it is larger than the sum of its proper divisors (27506709).

55523691 is a wasteful number, since it uses less digits than its factorization.

55523691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19335 (or 19329 counting only the distinct ones).

The product of its digits is 40500, while the sum is 36.

The square root of 55523691 is about 7451.4220790397. The cubic root of 55523691 is about 381.4984486114.

The spelling of 55523691 in words is "fifty-five million, five hundred twenty-three thousand, six hundred ninety-one".