72641281 has 2 divisors, whose sum is σ = 72641282. Its totient is φ = 72641280.

The previous prime is 72641269. The next prime is 72641341. The reversal of 72641281 is 18214627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72522256 + 119025 = 8516^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 72641281 - 2⁹ = 72640769 is a prime.

It is a super-2 number, since 2×72641281² = 10553511410641922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72641251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36320640 + 36320641.

It is an arithmetic number, because the mean of its divisors is an integer number (36320641).

Almost surely, 2^72641281 is an apocalyptic number.

It is an amenable number.

72641281 is a deficient number, since it is larger than the sum of its proper divisors (1).

72641281 is an equidigital number, since it uses as much as digits as its factorization.

72641281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 31.

The square root of 72641281 is about 8522.9854511198. The cubic root of 72641281 is about 417.2482252153.

The spelling of 72641281 in words is "seventy-two million, six hundred forty-one thousand, two hundred eighty-one".