72897491 has 2 divisors, whose sum is σ = 72897492. Its totient is φ = 72897490.

The previous prime is 72897431. The next prime is 72897493. The reversal of 72897491 is 19479827.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72897491 is a prime.

Together with 72897493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72897493) 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, 36448745 + 36448746.

It is an arithmetic number, because the mean of its divisors is an integer number (36448746).

Almost surely, 2^72897491 is an apocalyptic number.

72897491 is a deficient number, since it is larger than the sum of its proper divisors (1).

72897491 is an equidigital number, since it uses as much as digits as its factorization.

72897491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 72897491 is about 8538.0027524006. The cubic root of 72897491 is about 417.7382024819.

Subtracting from 72897491 its sum of digits (47), we obtain a square (72897444 = 8538²).

The spelling of 72897491 in words is "seventy-two million, eight hundred ninety-seven thousand, four hundred ninety-one".