72237121 has 12 divisors (see below), whose sum is σ = 81343332. Its totient is φ = 64064000.

The previous prime is 72237103. The next prime is 72237149. The reversal of 72237121 is 12173227.

It can be written as a sum of positive squares in 2 ways, for example, as 32092225 + 40144896 = 5665^2 + 6336^2 .

It is not a de Polignac number, because 72237121 - 2⁹ = 72236609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72231121) 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, 2320 + ... + 12241.

It is an arithmetic number, because the mean of its divisors is an integer number (6778611).

Almost surely, 2^72237121 is an apocalyptic number.

It is an amenable number.

72237121 is a deficient number, since it is larger than the sum of its proper divisors (9106211).

72237121 is a wasteful number, since it uses less digits than its factorization.

72237121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14624 (or 14613 counting only the distinct ones).

The product of its digits is 1176, while the sum is 25.

The square root of 72237121 is about 8499.2423780005. The cubic root of 72237121 is about 416.4729600583.

The spelling of 72237121 in words is "seventy-two million, two hundred thirty-seven thousand, one hundred twenty-one".