55931951 has 4 divisors (see below), whose sum is σ = 56244600. Its totient is φ = 55619304.

The previous prime is 55931899. The next prime is 55931963. The reversal of 55931951 is 15913955.

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 55931951 - 2¹⁸ = 55669807 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 (55931971) 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, 156056 + ... + 156413.

It is an arithmetic number, because the mean of its divisors is an integer number (14061150).

Almost surely, 2^55931951 is an apocalyptic number.

55931951 is a deficient number, since it is larger than the sum of its proper divisors (312649).

55931951 is a wasteful number, since it uses less digits than its factorization.

55931951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312648.

The product of its digits is 30375, while the sum is 38.

The square root of 55931951 is about 7478.7666763979. The cubic root of 55931951 is about 382.4312058203.

The spelling of 55931951 in words is "fifty-five million, nine hundred thirty-one thousand, nine hundred fifty-one".