55691279 has 4 divisors (see below), whose sum is σ = 63647184. Its totient is φ = 47735376.

The previous prime is 55691267. The next prime is 55691291. The reversal of 55691279 is 97219655.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (55691267) and next prime (55691291).

It is a cyclic number.

It is not a de Polignac number, because 55691279 - 2⁴ = 55691263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55691219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3977942 + ... + 3977955.

It is an arithmetic number, because the mean of its divisors is an integer number (15911796).

Almost surely, 2^55691279 is an apocalyptic number.

55691279 is a deficient number, since it is larger than the sum of its proper divisors (7955905).

55691279 is an equidigital number, since it uses as much as digits as its factorization.

55691279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7955904.

The product of its digits is 170100, while the sum is 44.

The square root of 55691279 is about 7462.6589765311. The cubic root of 55691279 is about 381.8818906078.

The spelling of 55691279 in words is "fifty-five million, six hundred ninety-one thousand, two hundred seventy-nine".