74149991 has 2 divisors, whose sum is σ = 74149992. Its totient is φ = 74149990.

The previous prime is 74149963. The next prime is 74149997. The reversal of 74149991 is 19994147.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74149991 - 2⁶ = 74149927 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 (74149997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37074995 + 37074996.

It is an arithmetic number, because the mean of its divisors is an integer number (37074996).

Almost surely, 2^74149991 is an apocalyptic number.

74149991 is a deficient number, since it is larger than the sum of its proper divisors (1).

74149991 is an equidigital number, since it uses as much as digits as its factorization.

74149991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 74149991 is about 8611.0389036399. The cubic root of 74149991 is about 420.1171083112.

The spelling of 74149991 in words is "seventy-four million, one hundred forty-nine thousand, nine hundred ninety-one".