74719991 has 2 divisors, whose sum is σ = 74719992. Its totient is φ = 74719990.

The previous prime is 74719969. The next prime is 74720021. The reversal of 74719991 is 19991747.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 74719991 - 2¹⁰ = 74718967 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74719291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37359995 + 37359996.

It is an arithmetic number, because the mean of its divisors is an integer number (37359996).

Almost surely, 2^74719991 is an apocalyptic number.

74719991 is a deficient number, since it is larger than the sum of its proper divisors (1).

74719991 is an equidigital number, since it uses as much as digits as its factorization.

74719991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 47.

The square root of 74719991 is about 8644.0725934018. The cubic root of 74719991 is about 421.1908587473.

The spelling of 74719991 in words is "seventy-four million, seven hundred nineteen thousand, nine hundred ninety-one".