72931091 has 8 divisors (see below), whose sum is σ = 76546080. Its totient is φ = 69353152.

The previous prime is 72931049. The next prime is 72931109. The reversal of 72931091 is 19013927.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72931091 - 2¹⁴ = 72914707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72931031) 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 in 7 ways as a sum of consecutive naturals, for example, 5186 + ... + 13143.

It is an arithmetic number, because the mean of its divisors is an integer number (9568260).

Almost surely, 2^72931091 is an apocalyptic number.

72931091 is a deficient number, since it is larger than the sum of its proper divisors (3614989).

72931091 is a wasteful number, since it uses less digits than its factorization.

72931091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18525.

The product of its (nonzero) digits is 3402, while the sum is 32.

The square root of 72931091 is about 8539.9701990112. The cubic root of 72931091 is about 417.8023740900.

The spelling of 72931091 in words is "seventy-two million, nine hundred thirty-one thousand, ninety-one".