74765021 has 2 divisors, whose sum is σ = 74765022. Its totient is φ = 74765020.

The previous prime is 74765011. The next prime is 74765029. The reversal of 74765021 is 12056747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71740900 + 3024121 = 8470^2 + 1739^2 .

It is a cyclic number.

It is not a de Polignac number, because 74765021 - 2⁶ = 74764957 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 (74765029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37382510 + 37382511.

It is an arithmetic number, because the mean of its divisors is an integer number (37382511).

Almost surely, 2^74765021 is an apocalyptic number.

It is an amenable number.

74765021 is a deficient number, since it is larger than the sum of its proper divisors (1).

74765021 is an equidigital number, since it uses as much as digits as its factorization.

74765021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 74765021 is about 8646.6768761184. The cubic root of 74765021 is about 421.2754519750.

The spelling of 74765021 in words is "seventy-four million, seven hundred sixty-five thousand, twenty-one".