72943531 has 2 divisors, whose sum is σ = 72943532. Its totient is φ = 72943530.

The previous prime is 72943487. The next prime is 72943597. The reversal of 72943531 is 13534927.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72943531 - 2⁹ = 72943019 is a prime.

It is a super-2 number, since 2×72943531² = 10641517429495922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72943231) 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, 36471765 + 36471766.

It is an arithmetic number, because the mean of its divisors is an integer number (36471766).

Almost surely, 2^72943531 is an apocalyptic number.

72943531 is a deficient number, since it is larger than the sum of its proper divisors (1).

72943531 is an equidigital number, since it uses as much as digits as its factorization.

72943531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 34.

The square root of 72943531 is about 8540.6985077334. The cubic root of 72943531 is about 417.8261278644.

The spelling of 72943531 in words is "seventy-two million, nine hundred forty-three thousand, five hundred thirty-one".