74707991 has 2 divisors, whose sum is σ = 74707992. Its totient is φ = 74707990.

The previous prime is 74707961. The next prime is 74708003. The reversal of 74707991 is 19970747.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (19970747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74707991 - 2¹⁴ = 74691607 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 (74707901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37353995 + 37353996.

It is an arithmetic number, because the mean of its divisors is an integer number (37353996).

Almost surely, 2^74707991 is an apocalyptic number.

74707991 is a deficient number, since it is larger than the sum of its proper divisors (1).

74707991 is an equidigital number, since it uses as much as digits as its factorization.

74707991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 74707991 is about 8643.3784482689. The cubic root of 74707991 is about 421.1683098469.

The spelling of 74707991 in words is "seventy-four million, seven hundred seven thousand, nine hundred ninety-one".