72051131 has 2 divisors, whose sum is σ = 72051132. Its totient is φ = 72051130.

The previous prime is 72051127. The next prime is 72051139. The reversal of 72051131 is 13115027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72051131 - 2² = 72051127 is a prime.

It is a super-2 number, since 2×72051131² = 10382730956758322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (72051139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36025565 + 36025566.

It is an arithmetic number, because the mean of its divisors is an integer number (36025566).

Almost surely, 2^72051131 is an apocalyptic number.

72051131 is a deficient number, since it is larger than the sum of its proper divisors (1).

72051131 is an equidigital number, since it uses as much as digits as its factorization.

72051131 is an odious number, because the sum of its binary digits is odd.

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

The square root of 72051131 is about 8488.2937625886. The cubic root of 72051131 is about 416.1152197950.

Adding to 72051131 its reverse (13115027), we get a palindrome (85166158).

The spelling of 72051131 in words is "seventy-two million, fifty-one thousand, one hundred thirty-one".