72571531 has 2 divisors, whose sum is σ = 72571532. Its totient is φ = 72571530.

The previous prime is 72571501. The next prime is 72571537. The reversal of 72571531 is 13517527.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72571531 - 2¹⁹ = 72047243 is a prime.

It is a super-2 number, since 2×72571531² = 10533254223367922, which contains 22 as substring.

It is equal to p_4260397 and since 72571531 and 4260397 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 72571493 and 72571502.

It is not a weakly prime, because it can be changed into another prime (72571537) 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, 36285765 + 36285766.

It is an arithmetic number, because the mean of its divisors is an integer number (36285766).

Almost surely, 2^72571531 is an apocalyptic number.

72571531 is a deficient number, since it is larger than the sum of its proper divisors (1).

72571531 is an equidigital number, since it uses as much as digits as its factorization.

72571531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7350, while the sum is 31.

The square root of 72571531 is about 8518.8925923503. The cubic root of 72571531 is about 417.1146355026.

The spelling of 72571531 in words is "seventy-two million, five hundred seventy-one thousand, five hundred thirty-one".