71959919 has 2 divisors, whose sum is σ = 71959920. Its totient is φ = 71959918.

The previous prime is 71959913. The next prime is 71959967. The reversal of 71959919 is 91995917.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71959919 - 2¹² = 71955823 is a prime.

It is a super-2 number, since 2×71959919² = 10356459884973122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71959913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35979959 + 35979960.

It is an arithmetic number, because the mean of its divisors is an integer number (35979960).

Almost surely, 2^71959919 is an apocalyptic number.

71959919 is a deficient number, since it is larger than the sum of its proper divisors (1).

71959919 is an equidigital number, since it uses as much as digits as its factorization.

71959919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 229635, while the sum is 50.

The square root of 71959919 is about 8482.9192498809. The cubic root of 71959919 is about 415.9395541335.

The spelling of 71959919 in words is "seventy-one million, nine hundred fifty-nine thousand, nine hundred nineteen".