72311251 has 16 divisors (see below), whose sum is σ = 80898048. Its totient is φ = 64310400.

The previous prime is 72311243. The next prime is 72311273. The reversal of 72311251 is 15211327.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 72311251 - 2³ = 72311243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72311651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21066 + ... + 24256.

It is an arithmetic number, because the mean of its divisors is an integer number (5056128).

Almost surely, 2^72311251 is an apocalyptic number.

72311251 is a deficient number, since it is larger than the sum of its proper divisors (8586797).

72311251 is a wasteful number, since it uses less digits than its factorization.

72311251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3282.

The product of its digits is 420, while the sum is 22.

The square root of 72311251 is about 8503.6022366995. The cubic root of 72311251 is about 416.6153733836.

Adding to 72311251 its reverse (15211327), we get a palindrome (87522578).

The spelling of 72311251 in words is "seventy-two million, three hundred eleven thousand, two hundred fifty-one".