74670991 has 2 divisors, whose sum is σ = 74670992. Its totient is φ = 74670990.

The previous prime is 74670989. The next prime is 74670997. The reversal of 74670991 is 19907647.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 74670991 - 2¹ = 74670989 is a prime.

Together with 74670989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74670997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37335495 + 37335496.

It is an arithmetic number, because the mean of its divisors is an integer number (37335496).

Almost surely, 2^74670991 is an apocalyptic number.

74670991 is a deficient number, since it is larger than the sum of its proper divisors (1).

74670991 is an equidigital number, since it uses as much as digits as its factorization.

74670991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 74670991 is about 8641.2378164242. The cubic root of 74670991 is about 421.0987688667.

The spelling of 74670991 in words is "seventy-four million, six hundred seventy thousand, nine hundred ninety-one".