72142331 has 2 divisors, whose sum is σ = 72142332. Its totient is φ = 72142330.

The previous prime is 72142327. The next prime is 72142337. The reversal of 72142331 is 13324127.

It is a weak prime.

It is an emirp because it is prime and its reverse (13324127) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 72142331 - 2² = 72142327 is a prime.

It is a super-2 number, since 2×72142331² = 10409031844227122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 72142297 and 72142306.

It is not a weakly prime, because it can be changed into another prime (72142337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36071165 + 36071166.

It is an arithmetic number, because the mean of its divisors is an integer number (36071166).

Almost surely, 2^72142331 is an apocalyptic number.

72142331 is a deficient number, since it is larger than the sum of its proper divisors (1).

72142331 is an equidigital number, since it uses as much as digits as its factorization.

72142331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 23.

The square root of 72142331 is about 8493.6641680726. The cubic root of 72142331 is about 416.2907141832.

Adding to 72142331 its reverse (13324127), we get a palindrome (85466458).

The spelling of 72142331 in words is "seventy-two million, one hundred forty-two thousand, three hundred thirty-one".