55550691 has 20 divisors (see below), whose sum is σ = 94838832. Its totient is φ = 31742928.

The previous prime is 55550641. The next prime is 55550701. The reversal of 55550691 is 19605555.

It is not a de Polignac number, because 55550691 - 2⁹ = 55550179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55550641) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48420 + ... + 49553.

Almost surely, 2^55550691 is an apocalyptic number.

55550691 is a deficient number, since it is larger than the sum of its proper divisors (39288141).

55550691 is an equidigital number, since it uses as much as digits as its factorization.

55550691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97992 (or 97983 counting only the distinct ones).

The product of its (nonzero) digits is 33750, while the sum is 36.

The square root of 55550691 is about 7453.2335935485. The cubic root of 55550691 is about 381.5602768073.

The spelling of 55550691 in words is "fifty-five million, five hundred fifty thousand, six hundred ninety-one".