72331169 has 2 divisors, whose sum is σ = 72331170. Its totient is φ = 72331168.

The previous prime is 72331151. The next prime is 72331183. The reversal of 72331169 is 96113327.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42081169 + 30250000 = 6487^2 + 5500^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72331169 is a prime.

It is a super-2 number, since 2×72331169² = 10463596017813122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72331139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36165584 + 36165585.

It is an arithmetic number, because the mean of its divisors is an integer number (36165585).

Almost surely, 2^72331169 is an apocalyptic number.

It is an amenable number.

72331169 is a deficient number, since it is larger than the sum of its proper divisors (1).

72331169 is an equidigital number, since it uses as much as digits as its factorization.

72331169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 32.

The square root of 72331169 is about 8504.7733067966. The cubic root of 72331169 is about 416.6536218494.

The spelling of 72331169 in words is "seventy-two million, three hundred thirty-one thousand, one hundred sixty-nine".