55651231 has 4 divisors (see below), whose sum is σ = 57446464. Its totient is φ = 53856000.

The previous prime is 55651229. The next prime is 55651249. The reversal of 55651231 is 13215655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13215655 = 5 ⋅2643131.

It is a cyclic number.

It is not a de Polignac number, because 55651231 - 2¹ = 55651229 is a prime.

It is a super-2 number, since 2×55651231² = 6194119023630722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55651231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55651831) 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, 897570 + ... + 897631.

It is an arithmetic number, because the mean of its divisors is an integer number (14361616).

Almost surely, 2^55651231 is an apocalyptic number.

55651231 is a deficient number, since it is larger than the sum of its proper divisors (1795233).

55651231 is a wasteful number, since it uses less digits than its factorization.

55651231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795232.

The product of its digits is 4500, while the sum is 28.

The square root of 55651231 is about 7459.9752680555. The cubic root of 55651231 is about 381.7903306508.

Adding to 55651231 its reverse (13215655), we get a palindrome (68866886).

The spelling of 55651231 in words is "fifty-five million, six hundred fifty-one thousand, two hundred thirty-one".