51233239 has 2 divisors, whose sum is σ = 51233240. Its totient is φ = 51233238.

The previous prime is 51233209. The next prime is 51233251. The reversal of 51233239 is 93233215.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51233239 is a prime.

It is a super-2 number, since 2×51233239² = 5249689556862242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51233209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25616619 + 25616620.

It is an arithmetic number, because the mean of its divisors is an integer number (25616620).

Almost surely, 2^51233239 is an apocalyptic number.

51233239 is a deficient number, since it is larger than the sum of its proper divisors (1).

51233239 is an equidigital number, since it uses as much as digits as its factorization.

51233239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 28.

The square root of 51233239 is about 7157.7397968912. The cubic root of 51233239 is about 371.4074443957.

The spelling of 51233239 in words is "fifty-one million, two hundred thirty-three thousand, two hundred thirty-nine".