74149721 has 2 divisors, whose sum is σ = 74149722. Its totient is φ = 74149720.

The previous prime is 74149717. The next prime is 74149729. The reversal of 74149721 is 12794147.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74149321 + 400 = 8611^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 74149721 - 2² = 74149717 is a prime.

It is a super-2 number, since 2×74149721² = 10996362248755682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (74149729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37074860 + 37074861.

It is an arithmetic number, because the mean of its divisors is an integer number (37074861).

Almost surely, 2^74149721 is an apocalyptic number.

It is an amenable number.

74149721 is a deficient number, since it is larger than the sum of its proper divisors (1).

74149721 is an equidigital number, since it uses as much as digits as its factorization.

74149721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 35.

The square root of 74149721 is about 8611.0232260748. The cubic root of 74149721 is about 420.1165983909.

The spelling of 74149721 in words is "seventy-four million, one hundred forty-nine thousand, seven hundred twenty-one".