72501331 has 12 divisors (see below), whose sum is σ = 84573408. Its totient is φ = 61970832.

The previous prime is 72501329. The next prime is 72501353. The reversal of 72501331 is 13310527.

It is not a de Polignac number, because 72501331 - 2¹ = 72501329 is a prime.

It is a super-2 number, since 2×72501331² = 10512885993543122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72501301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17590 + ... + 21316.

It is an arithmetic number, because the mean of its divisors is an integer number (7047784).

Almost surely, 2^72501331 is an apocalyptic number.

72501331 is a deficient number, since it is larger than the sum of its proper divisors (12072077).

72501331 is a wasteful number, since it uses less digits than its factorization.

72501331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138 (or 4131 counting only the distinct ones).

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

The square root of 72501331 is about 8514.7713416157. The cubic root of 72501331 is about 416.9800974654.

Adding to 72501331 its reverse (13310527), we get a palindrome (85811858).

The spelling of 72501331 in words is "seventy-two million, five hundred one thousand, three hundred thirty-one".