72151139 has 2 divisors, whose sum is σ = 72151140. Its totient is φ = 72151138.

The previous prime is 72151129. The next prime is 72151169. The reversal of 72151139 is 93115127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72151139 - 2¹² = 72147043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72151109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36075569 + 36075570.

It is an arithmetic number, because the mean of its divisors is an integer number (36075570).

Almost surely, 2^72151139 is an apocalyptic number.

72151139 is a deficient number, since it is larger than the sum of its proper divisors (1).

72151139 is an equidigital number, since it uses as much as digits as its factorization.

72151139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1890, while the sum is 29.

The square root of 72151139 is about 8494.1826563831. The cubic root of 72151139 is about 416.3076554128.

The spelling of 72151139 in words is "seventy-two million, one hundred fifty-one thousand, one hundred thirty-nine".