72231277 has 2 divisors, whose sum is σ = 72231278. Its totient is φ = 72231276.

The previous prime is 72231253. The next prime is 72231287. The reversal of 72231277 is 77213227.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52330756 + 19900521 = 7234^2 + 4461^2 .

It is a cyclic number.

It is not a de Polignac number, because 72231277 - 2¹⁵ = 72198509 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72231287) 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, 36115638 + 36115639.

It is an arithmetic number, because the mean of its divisors is an integer number (36115639).

Almost surely, 2^72231277 is an apocalyptic number.

It is an amenable number.

72231277 is a deficient number, since it is larger than the sum of its proper divisors (1).

72231277 is an equidigital number, since it uses as much as digits as its factorization.

72231277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8232, while the sum is 31.

The square root of 72231277 is about 8498.8985756979. The cubic root of 72231277 is about 416.4617288355.

The spelling of 72231277 in words is "seventy-two million, two hundred thirty-one thousand, two hundred seventy-seven".