72169831 has 2 divisors, whose sum is σ = 72169832. Its totient is φ = 72169830.

The previous prime is 72169813. The next prime is 72169849. The reversal of 72169831 is 13896127.

Together with previous prime (72169813) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (72169813) and next prime (72169849).

It is a cyclic number.

It is not a de Polignac number, because 72169831 - 2⁷ = 72169703 is a prime.

It is a super-2 number, since 2×72169831² = 10416969013137122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72169231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36084915 + 36084916.

It is an arithmetic number, because the mean of its divisors is an integer number (36084916).

Almost surely, 2^72169831 is an apocalyptic number.

72169831 is a deficient number, since it is larger than the sum of its proper divisors (1).

72169831 is an equidigital number, since it uses as much as digits as its factorization.

72169831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 37.

The square root of 72169831 is about 8495.2828675683. The cubic root of 72169831 is about 416.3436028740.

The spelling of 72169831 in words is "seventy-two million, one hundred sixty-nine thousand, eight hundred thirty-one".