72179431 has 2 divisors, whose sum is σ = 72179432. Its totient is φ = 72179430.

The previous prime is 72179411. The next prime is 72179447. The reversal of 72179431 is 13497127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72179431 - 2⁹ = 72178919 is a prime.

It is a super-2 number, since 2×72179431² = 10419740518967522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72179411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36089715 + 36089716.

It is an arithmetic number, because the mean of its divisors is an integer number (36089716).

Almost surely, 2^72179431 is an apocalyptic number.

72179431 is a deficient number, since it is larger than the sum of its proper divisors (1).

72179431 is an equidigital number, since it uses as much as digits as its factorization.

72179431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 34.

The square root of 72179431 is about 8495.8478682236. The cubic root of 72179431 is about 416.3620626714.

The spelling of 72179431 in words is "seventy-two million, one hundred seventy-nine thousand, four hundred thirty-one".