72459731 has 2 divisors, whose sum is σ = 72459732. Its totient is φ = 72459730.

The previous prime is 72459707. The next prime is 72459733. The reversal of 72459731 is 13795427.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72459731 - 2²² = 68265427 is a prime.

It is a super-2 number, since 2×72459731² = 10500825233184722, which contains 22 as substring.

Together with 72459733, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72459733) 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, 36229865 + 36229866.

It is an arithmetic number, because the mean of its divisors is an integer number (36229866).

Almost surely, 2^72459731 is an apocalyptic number.

72459731 is a deficient number, since it is larger than the sum of its proper divisors (1).

72459731 is an equidigital number, since it uses as much as digits as its factorization.

72459731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 38.

The square root of 72459731 is about 8512.3281774142. The cubic root of 72459731 is about 416.9003302365.

The spelling of 72459731 in words is "seventy-two million, four hundred fifty-nine thousand, seven hundred thirty-one".