72619931 has 2 divisors, whose sum is σ = 72619932. Its totient is φ = 72619930.

The previous prime is 72619891. The next prime is 72619933. The reversal of 72619931 is 13991627.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72619931 is a prime.

It is a super-2 number, since 2×72619931² = 10547308756889522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 72619933, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72619933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36309965 + 36309966.

It is an arithmetic number, because the mean of its divisors is an integer number (36309966).

Almost surely, 2^72619931 is an apocalyptic number.

72619931 is a deficient number, since it is larger than the sum of its proper divisors (1).

72619931 is an equidigital number, since it uses as much as digits as its factorization.

72619931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 38.

The square root of 72619931 is about 8521.7328636845. The cubic root of 72619931 is about 417.2073433991.

The spelling of 72619931 in words is "seventy-two million, six hundred nineteen thousand, nine hundred thirty-one".