51239223 has 32 divisors (see below), whose sum is σ = 87851520. Its totient is φ = 29270808.

The previous prime is 51239203. The next prime is 51239231. The reversal of 51239223 is 32293215.

It is not a de Polignac number, because 51239223 - 2⁹ = 51238711 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51239203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13636 + ... + 16982.

It is an arithmetic number, because the mean of its divisors is an integer number (2745360).

Almost surely, 2^51239223 is an apocalyptic number.

51239223 is a deficient number, since it is larger than the sum of its proper divisors (36612297).

51239223 is an frugal number, since it uses more digits than its factorization.

51239223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3375 (or 3357 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 51239223 is about 7158.1577937344. The cubic root of 51239223 is about 371.4219038603.

The spelling of 51239223 in words is "fifty-one million, two hundred thirty-nine thousand, two hundred twenty-three".