55237691 has 8 divisors (see below), whose sum is σ = 57145344. Its totient is φ = 53337960.

The previous prime is 55237673. The next prime is 55237729. The reversal of 55237691 is 19673255.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55237691 is a prime.

It is a super-2 number, since 2×55237691² = 6102405014022962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55237661) 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, 14510 + ... + 17916.

It is an arithmetic number, because the mean of its divisors is an integer number (7143168).

Almost surely, 2^55237691 is an apocalyptic number.

55237691 is a deficient number, since it is larger than the sum of its proper divisors (1907653).

55237691 is a wasteful number, since it uses less digits than its factorization.

55237691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3961.

The product of its digits is 56700, while the sum is 38.

The square root of 55237691 is about 7432.2063345954. The cubic root of 55237691 is about 380.8422936740.

The spelling of 55237691 in words is "fifty-five million, two hundred thirty-seven thousand, six hundred ninety-one".