72521011 has 2 divisors, whose sum is σ = 72521012. Its totient is φ = 72521010.

The previous prime is 72521003. The next prime is 72521021. The reversal of 72521011 is 11012527.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72521011 - 2³ = 72521003 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72521011.

It is not a weakly prime, because it can be changed into another prime (72521021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36260505 + 36260506.

It is an arithmetic number, because the mean of its divisors is an integer number (36260506).

Almost surely, 2^72521011 is an apocalyptic number.

72521011 is a deficient number, since it is larger than the sum of its proper divisors (1).

72521011 is an equidigital number, since it uses as much as digits as its factorization.

72521011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 72521011 is about 8515.9269019878. The cubic root of 72521011 is about 417.0178228690.

Adding to 72521011 its reverse (11012527), we get a palindrome (83533538).

It can be divided in two parts, 725 and 21011, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 72521011 in words is "seventy-two million, five hundred twenty-one thousand, eleven".