74991731 has 2 divisors, whose sum is σ = 74991732. Its totient is φ = 74991730.

The previous prime is 74991713. The next prime is 74991779. The reversal of 74991731 is 13719947.

Together with previous prime (74991713) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (13719947) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74991731 is a prime.

It is a super-2 number, since 2×74991731² = 11247519436752722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74991701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37495865 + 37495866.

It is an arithmetic number, because the mean of its divisors is an integer number (37495866).

Almost surely, 2^74991731 is an apocalyptic number.

74991731 is a deficient number, since it is larger than the sum of its proper divisors (1).

74991731 is an equidigital number, since it uses as much as digits as its factorization.

74991731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 41.

The square root of 74991731 is about 8659.7766137470. The cubic root of 74991731 is about 421.7008335375.

The spelling of 74991731 in words is "seventy-four million, nine hundred ninety-one thousand, seven hundred thirty-one".