72107251 has 4 divisors (see below), whose sum is σ = 76348872. Its totient is φ = 67865632.

The previous prime is 72107219. The next prime is 72107267. The reversal of 72107251 is 15270127.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 72107251 - 2⁵ = 72107219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72107281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2120785 + ... + 2120818.

It is an arithmetic number, because the mean of its divisors is an integer number (19087218).

Almost surely, 2^72107251 is an apocalyptic number.

72107251 is a deficient number, since it is larger than the sum of its proper divisors (4241621).

72107251 is a wasteful number, since it uses less digits than its factorization.

72107251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4241620.

The product of its (nonzero) digits is 980, while the sum is 25.

The square root of 72107251 is about 8491.5988482735. The cubic root of 72107251 is about 416.2232279342.

Adding to 72107251 its reverse (15270127), we get a palindrome (87377378).

The spelling of 72107251 in words is "seventy-two million, one hundred seven thousand, two hundred fifty-one".