74888921 has 2 divisors, whose sum is σ = 74888922. Its totient is φ = 74888920.

The previous prime is 74888917. The next prime is 74888923. The reversal of 74888921 is 12988847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74149321 + 739600 = 8611^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 74888921 - 2² = 74888917 is a prime.

Together with 74888923, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74888923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37444460 + 37444461.

It is an arithmetic number, because the mean of its divisors is an integer number (37444461).

Almost surely, 2^74888921 is an apocalyptic number.

It is an amenable number.

74888921 is a deficient number, since it is larger than the sum of its proper divisors (1).

74888921 is an equidigital number, since it uses as much as digits as its factorization.

74888921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 258048, while the sum is 47.

The square root of 74888921 is about 8653.8385124753. The cubic root of 74888921 is about 421.5080349903.

The spelling of 74888921 in words is "seventy-four million, eight hundred eighty-eight thousand, nine hundred twenty-one".