72391519 has 2 divisors, whose sum is σ = 72391520. Its totient is φ = 72391518.

The previous prime is 72391513. The next prime is 72391523. The reversal of 72391519 is 91519327.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72391519 is a prime.

It is a super-2 number, since 2×72391519² = 10481064046254722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72391513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36195759 + 36195760.

It is an arithmetic number, because the mean of its divisors is an integer number (36195760).

Almost surely, 2^72391519 is an apocalyptic number.

72391519 is a deficient number, since it is larger than the sum of its proper divisors (1).

72391519 is an equidigital number, since it uses as much as digits as its factorization.

72391519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17010, while the sum is 37.

The square root of 72391519 is about 8508.3205745905. The cubic root of 72391519 is about 416.7694688918.

The spelling of 72391519 in words is "seventy-two million, three hundred ninety-one thousand, five hundred nineteen".