72015131 has 2 divisors, whose sum is σ = 72015132. Its totient is φ = 72015130.

The previous prime is 72015089. The next prime is 72015137. The reversal of 72015131 is 13151027.

It is a strong prime.

It is an emirp because it is prime and its reverse (13151027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72015131 - 2²² = 67820827 is a prime.

It is a super-2 number, since 2×72015131² = 10372358185894322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72015137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36007565 + 36007566.

It is an arithmetic number, because the mean of its divisors is an integer number (36007566).

Almost surely, 2^72015131 is an apocalyptic number.

72015131 is a deficient number, since it is larger than the sum of its proper divisors (1).

72015131 is an equidigital number, since it uses as much as digits as its factorization.

72015131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 72015131 is about 8486.1729301258. The cubic root of 72015131 is about 416.0459049287.

Adding to 72015131 its reverse (13151027), we get a palindrome (85166158).

It can be divided in two parts, 720 and 15131, that added together give a palindrome (15851).

The spelling of 72015131 in words is "seventy-two million, fifteen thousand, one hundred thirty-one".