72312547 has 2 divisors, whose sum is σ = 72312548. Its totient is φ = 72312546.

The previous prime is 72312523. The next prime is 72312551. The reversal of 72312547 is 74521327.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72312547 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72312047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36156273 + 36156274.

It is an arithmetic number, because the mean of its divisors is an integer number (36156274).

Almost surely, 2^72312547 is an apocalyptic number.

72312547 is a deficient number, since it is larger than the sum of its proper divisors (1).

72312547 is an equidigital number, since it uses as much as digits as its factorization.

72312547 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 31.

The square root of 72312547 is about 8503.6784393579. The cubic root of 72312547 is about 416.6178623015.

The spelling of 72312547 in words is "seventy-two million, three hundred twelve thousand, five hundred forty-seven".