71641931 has 2 divisors, whose sum is σ = 71641932. Its totient is φ = 71641930.

The previous prime is 71641907. The next prime is 71641943. The reversal of 71641931 is 13914617.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71641931 is a prime.

It is a super-2 number, since 2×71641931² = 10265132554817522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71641901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35820965 + 35820966.

It is an arithmetic number, because the mean of its divisors is an integer number (35820966).

Almost surely, 2^71641931 is an apocalyptic number.

71641931 is a deficient number, since it is larger than the sum of its proper divisors (1).

71641931 is an equidigital number, since it uses as much as digits as its factorization.

71641931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 32.

The square root of 71641931 is about 8464.1556578314. The cubic root of 71641931 is about 415.3259760414.

The spelling of 71641931 in words is "seventy-one million, six hundred forty-one thousand, nine hundred thirty-one".