72700531 has 2 divisors, whose sum is σ = 72700532. Its totient is φ = 72700530.

The previous prime is 72700519. The next prime is 72700541. The reversal of 72700531 is 13500727.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72700531 - 2⁵ = 72700499 is a prime.

It is a super-2 number, since 2×72700531² = 10570734415363922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72700496 and 72700505.

It is not a weakly prime, because it can be changed into another prime (72700501) 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, 36350265 + 36350266.

It is an arithmetic number, because the mean of its divisors is an integer number (36350266).

Almost surely, 2^72700531 is an apocalyptic number.

72700531 is a deficient number, since it is larger than the sum of its proper divisors (1).

72700531 is an equidigital number, since it uses as much as digits as its factorization.

72700531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 72700531 is about 8526.4606373336. The cubic root of 72700531 is about 417.3616374906.

The spelling of 72700531 in words is "seventy-two million, seven hundred thousand, five hundred thirty-one".