51355231 has 2 divisors, whose sum is σ = 51355232. Its totient is φ = 51355230.

The previous prime is 51355207. The next prime is 51355237. The reversal of 51355231 is 13255315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51355231 - 2²⁵ = 17800799 is a prime.

It is a super-2 number, since 2×51355231² = 5274719502126722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51355196 and 51355205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51355237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25677615 + 25677616.

It is an arithmetic number, because the mean of its divisors is an integer number (25677616).

Almost surely, 2^51355231 is an apocalyptic number.

51355231 is a deficient number, since it is larger than the sum of its proper divisors (1).

51355231 is an equidigital number, since it uses as much as digits as its factorization.

51355231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2250, while the sum is 25.

The square root of 51355231 is about 7166.2564146143. The cubic root of 51355231 is about 371.7019981114.

The spelling of 51355231 in words is "fifty-one million, three hundred fifty-five thousand, two hundred thirty-one".