72671491 has 2 divisors, whose sum is σ = 72671492. Its totient is φ = 72671490.

The previous prime is 72671479. The next prime is 72671497. The reversal of 72671491 is 19417627.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72671491 - 2⁷ = 72671363 is a prime.

It is a super-2 number, since 2×72671491² = 10562291208326162, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72671491.

It is not a weakly prime, because it can be changed into another prime (72671497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36335745 + 36335746.

It is an arithmetic number, because the mean of its divisors is an integer number (36335746).

Almost surely, 2^72671491 is an apocalyptic number.

72671491 is a deficient number, since it is larger than the sum of its proper divisors (1).

72671491 is an equidigital number, since it uses as much as digits as its factorization.

72671491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 72671491 is about 8524.7575332088. The cubic root of 72671491 is about 417.3060588223.

The spelling of 72671491 in words is "seventy-two million, six hundred seventy-one thousand, four hundred ninety-one".