72169297 has 2 divisors, whose sum is σ = 72169298. Its totient is φ = 72169296.

The previous prime is 72169249. The next prime is 72169309. The reversal of 72169297 is 79296127.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71216721 + 952576 = 8439^2 + 976^2 .

It is a cyclic number.

It is not a de Polignac number, because 72169297 - 2⁷ = 72169169 is a prime.

It is not a weakly prime, because it can be changed into another prime (72169397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36084648 + 36084649.

It is an arithmetic number, because the mean of its divisors is an integer number (36084649).

Almost surely, 2^72169297 is an apocalyptic number.

It is an amenable number.

72169297 is a deficient number, since it is larger than the sum of its proper divisors (1).

72169297 is an equidigital number, since it uses as much as digits as its factorization.

72169297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 72169297 is about 8495.2514383036. The cubic root of 72169297 is about 416.3425759997.

The spelling of 72169297 in words is "seventy-two million, one hundred sixty-nine thousand, two hundred ninety-seven".