72401491 has 2 divisors, whose sum is σ = 72401492. Its totient is φ = 72401490.

The previous prime is 72401477. The next prime is 72401501. The reversal of 72401491 is 19410427.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72401491 - 2⁷ = 72401363 is a prime.

It is not a weakly prime, because it can be changed into another prime (72401431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36200745 + 36200746.

It is an arithmetic number, because the mean of its divisors is an integer number (36200746).

Almost surely, 2^72401491 is an apocalyptic number.

72401491 is a deficient number, since it is larger than the sum of its proper divisors (1).

72401491 is an equidigital number, since it uses as much as digits as its factorization.

72401491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 72401491 is about 8508.9065690017. The cubic root of 72401491 is about 416.7886048089.

The spelling of 72401491 in words is "seventy-two million, four hundred one thousand, four hundred ninety-one".