55951 has 4 divisors (see below), whose sum is σ = 63952. Its totient is φ = 47952.

The previous prime is 55949. The next prime is 55967. The reversal of 55951 is 15955.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15955 = 5 ⋅3191.

It is a cyclic number.

It is not a de Polignac number, because 55951 - 2¹ = 55949 is a prime.

55951 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55901) 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, 3990 + ... + 4003.

It is an arithmetic number, because the mean of its divisors is an integer number (15988).

2⁵⁵⁹⁵¹ is an apocalyptic number.

55951 is a deficient number, since it is larger than the sum of its proper divisors (8001).

55951 is an equidigital number, since it uses as much as digits as its factorization.

55951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8000.

The product of its digits is 1125, while the sum is 25.

The square root of 55951 is about 236.5396372704. The cubic root of 55951 is about 38.2474616340.

The spelling of 55951 in words is "fifty-five thousand, nine hundred fifty-one".