71989000639 has 2 divisors, whose sum is σ = 71989000640. Its totient is φ = 71989000638.

The previous prime is 71989000607. The next prime is 71989000697. The reversal of 71989000639 is 93600098917.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71989000639 - 2⁵ = 71989000607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71989000939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35994500319 + 35994500320.

It is an arithmetic number, because the mean of its divisors is an integer number (35994500320).

Almost surely, 2^71989000639 is an apocalyptic number.

71989000639 is a deficient number, since it is larger than the sum of its proper divisors (1).

71989000639 is an equidigital number, since it uses as much as digits as its factorization.

71989000639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 52.

The spelling of 71989000639 in words is "seventy-one billion, nine hundred eighty-nine million, six hundred thirty-nine", and thus it is an aban number.