71990539 has 2 divisors, whose sum is σ = 71990540. Its totient is φ = 71990538.

The previous prime is 71990533. The next prime is 71990551. The reversal of 71990539 is 93509917.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71990539 - 2⁵ = 71990507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 71990495 and 71990504.

It is not a weakly prime, because it can be changed into another prime (71990533) 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, 35995269 + 35995270.

It is an arithmetic number, because the mean of its divisors is an integer number (35995270).

Almost surely, 2^71990539 is an apocalyptic number.

71990539 is a deficient number, since it is larger than the sum of its proper divisors (1).

71990539 is an equidigital number, since it uses as much as digits as its factorization.

71990539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 71990539 is about 8484.7238611519. The cubic root of 71990539 is about 415.9985418927.

The spelling of 71990539 in words is "seventy-one million, nine hundred ninety thousand, five hundred thirty-nine".