71915231 has 2 divisors, whose sum is σ = 71915232. Its totient is φ = 71915230.

The previous prime is 71915213. The next prime is 71915237. The reversal of 71915231 is 13251917.

Together with previous prime (71915213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71915231 - 2⁶ = 71915167 is a prime.

It is a super-2 number, since 2×71915231² = 10343600899566722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71915194 and 71915203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71915237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35957615 + 35957616.

It is an arithmetic number, because the mean of its divisors is an integer number (35957616).

Almost surely, 2^71915231 is an apocalyptic number.

71915231 is a deficient number, since it is larger than the sum of its proper divisors (1).

71915231 is an equidigital number, since it uses as much as digits as its factorization.

71915231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1890, while the sum is 29.

The square root of 71915231 is about 8480.2848419142. The cubic root of 71915231 is about 415.8534351010.

The spelling of 71915231 in words is "seventy-one million, nine hundred fifteen thousand, two hundred thirty-one".