72972271 has 2 divisors, whose sum is σ = 72972272. Its totient is φ = 72972270.

The previous prime is 72972253. The next prime is 72972299. The reversal of 72972271 is 17227927.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72972271 - 2⁵ = 72972239 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72972271.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72972071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36486135 + 36486136.

It is an arithmetic number, because the mean of its divisors is an integer number (36486136).

Almost surely, 2^72972271 is an apocalyptic number.

72972271 is a deficient number, since it is larger than the sum of its proper divisors (1).

72972271 is an equidigital number, since it uses as much as digits as its factorization.

72972271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24696, while the sum is 37.

The square root of 72972271 is about 8542.3808742060. The cubic root of 72972271 is about 417.8809956321.

The spelling of 72972271 in words is "seventy-two million, nine hundred seventy-two thousand, two hundred seventy-one".