71500939 has 2 divisors, whose sum is σ = 71500940. Its totient is φ = 71500938.

The previous prime is 71500879. The next prime is 71500981. The reversal of 71500939 is 93900517.

It is a strong prime.

It is an emirp because it is prime and its reverse (93900517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71500939 - 2⁹ = 71500427 is a prime.

It is a super-2 number, since 2×71500939² = 10224768555763442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (71500999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35750469 + 35750470.

It is an arithmetic number, because the mean of its divisors is an integer number (35750470).

Almost surely, 2^71500939 is an apocalyptic number.

71500939 is a deficient number, since it is larger than the sum of its proper divisors (1).

71500939 is an equidigital number, since it uses as much as digits as its factorization.

71500939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8505, while the sum is 34.

The square root of 71500939 is about 8455.8227866956. The cubic root of 71500939 is about 415.0533419604.

The spelling of 71500939 in words is "seventy-one million, five hundred thousand, nine hundred thirty-nine".