72859531 has 2 divisors, whose sum is σ = 72859532. Its totient is φ = 72859530.

The previous prime is 72859529. The next prime is 72859537. The reversal of 72859531 is 13595827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72859531 - 2¹ = 72859529 is a prime.

It is a super-2 number, since 2×72859531² = 10617022515079922, which contains 22 as substring.

Together with 72859529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (72859537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36429765 + 36429766.

It is an arithmetic number, because the mean of its divisors is an integer number (36429766).

Almost surely, 2^72859531 is an apocalyptic number.

72859531 is a deficient number, since it is larger than the sum of its proper divisors (1).

72859531 is an equidigital number, since it uses as much as digits as its factorization.

72859531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The square root of 72859531 is about 8535.7794606000. The cubic root of 72859531 is about 417.6656801166.

The spelling of 72859531 in words is "seventy-two million, eight hundred fifty-nine thousand, five hundred thirty-one".