55619951 has 4 divisors (see below), whose sum is σ = 55771872. Its totient is φ = 55468032.

The previous prime is 55619947. The next prime is 55619953. The reversal of 55619951 is 15991655.

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

It is a cyclic number.

It is not a de Polignac number, because 55619951 - 2² = 55619947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55619899 and 55619908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55619953) 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, 75410 + ... + 76143.

It is an arithmetic number, because the mean of its divisors is an integer number (13942968).

Almost surely, 2^55619951 is an apocalyptic number.

55619951 is a deficient number, since it is larger than the sum of its proper divisors (151921).

55619951 is a wasteful number, since it uses less digits than its factorization.

55619951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151920.

The product of its digits is 60750, while the sum is 41.

The square root of 55619951 is about 7457.8784516778. The cubic root of 55619951 is about 381.7187860235.

The spelling of 55619951 in words is "fifty-five million, six hundred nineteen thousand, nine hundred fifty-one".