71899831 has 2 divisors, whose sum is σ = 71899832. Its totient is φ = 71899830.

The previous prime is 71899811. The next prime is 71899837. The reversal of 71899831 is 13899817.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71899831 - 2⁵ = 71899799 is a prime.

It is a super-2 number, since 2×71899831² = 10339171395657122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71899837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35949915 + 35949916.

It is an arithmetic number, because the mean of its divisors is an integer number (35949916).

Almost surely, 2^71899831 is an apocalyptic number.

71899831 is a deficient number, since it is larger than the sum of its proper divisors (1).

71899831 is an equidigital number, since it uses as much as digits as its factorization.

71899831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 46.

The square root of 71899831 is about 8479.3768049309. The cubic root of 71899831 is about 415.8237492241.

It can be divided in two parts, 7189 and 9831, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 71899831 in words is "seventy-one million, eight hundred ninety-nine thousand, eight hundred thirty-one".