72311669 has 2 divisors, whose sum is σ = 72311670. Its totient is φ = 72311668.

The previous prime is 72311651. The next prime is 72311689. The reversal of 72311669 is 96611327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66210769 + 6100900 = 8137^2 + 2470^2 .

It is an emirp because it is prime and its reverse (96611327) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72311669 is a prime.

It is a super-2 number, since 2×72311669² = 10457954947131122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72311689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36155834 + 36155835.

It is an arithmetic number, because the mean of its divisors is an integer number (36155835).

Almost surely, 2^72311669 is an apocalyptic number.

It is an amenable number.

72311669 is a deficient number, since it is larger than the sum of its proper divisors (1).

72311669 is an equidigital number, since it uses as much as digits as its factorization.

72311669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 35.

The square root of 72311669 is about 8503.6268144833. The cubic root of 72311669 is about 416.6161761397.

The spelling of 72311669 in words is "seventy-two million, three hundred eleven thousand, six hundred sixty-nine".