55009951 has 4 divisors (see below), whose sum is σ = 57401712. Its totient is φ = 52618192.

The previous prime is 55009939. The next prime is 55009957. The reversal of 55009951 is 15990055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15990055 = 5 ⋅3198011.

It is a cyclic number.

It is not a de Polignac number, because 55009951 - 2²³ = 46621343 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 (55009957) 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, 1195846 + ... + 1195891.

It is an arithmetic number, because the mean of its divisors is an integer number (14350428).

Almost surely, 2^55009951 is an apocalyptic number.

55009951 is a deficient number, since it is larger than the sum of its proper divisors (2391761).

55009951 is a wasteful number, since it uses less digits than its factorization.

55009951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2391760.

The product of its (nonzero) digits is 10125, while the sum is 34.

The square root of 55009951 is about 7416.8693530357. The cubic root of 55009951 is about 380.3181799536.

It can be divided in two parts, 5500 and 9951, that added together give a palindrome (15451).

The spelling of 55009951 in words is "fifty-five million, nine thousand, nine hundred fifty-one".