74290991 has 2 divisors, whose sum is σ = 74290992. Its totient is φ = 74290990.

The previous prime is 74290981. The next prime is 74291093. The reversal of 74290991 is 19909247.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 74290991 - 2⁶ = 74290927 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 (74290961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37145495 + 37145496.

It is an arithmetic number, because the mean of its divisors is an integer number (37145496).

Almost surely, 2^74290991 is an apocalyptic number.

74290991 is a deficient number, since it is larger than the sum of its proper divisors (1).

74290991 is an equidigital number, since it uses as much as digits as its factorization.

74290991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 74290991 is about 8619.2221806843. Note that the first 3 decimals coincide. The cubic root of 74290991 is about 420.3832310893.

The spelling of 74290991 in words is "seventy-four million, two hundred ninety thousand, nine hundred ninety-one".