72013531 has 2 divisors, whose sum is σ = 72013532. Its totient is φ = 72013530.

The previous prime is 72013517. The next prime is 72013559. The reversal of 72013531 is 13531027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72013531 - 2¹⁵ = 71980763 is a prime.

It is a super-2 number, since 2×72013531² = 10371897294175922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72016531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36006765 + 36006766.

It is an arithmetic number, because the mean of its divisors is an integer number (36006766).

Almost surely, 2^72013531 is an apocalyptic number.

72013531 is a deficient number, since it is larger than the sum of its proper divisors (1).

72013531 is an equidigital number, since it uses as much as digits as its factorization.

72013531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 22.

The square root of 72013531 is about 8486.0786586032. The cubic root of 72013531 is about 416.0428237319.

Adding to 72013531 its reverse (13531027), we get a palindrome (85544558).

The spelling of 72013531 in words is "seventy-two million, thirteen thousand, five hundred thirty-one".