74939521 has 2 divisors, whose sum is σ = 74939522. Its totient is φ = 74939520.

The previous prime is 74939489. The next prime is 74939531. The reversal of 74939521 is 12593947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55711296 + 19228225 = 7464^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 74939521 - 2⁵ = 74939489 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74939531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37469760 + 37469761.

It is an arithmetic number, because the mean of its divisors is an integer number (37469761).

Almost surely, 2^74939521 is an apocalyptic number.

It is an amenable number.

74939521 is a deficient number, since it is larger than the sum of its proper divisors (1).

74939521 is an equidigital number, since it uses as much as digits as its factorization.

74939521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 74939521 is about 8656.7615769409. The cubic root of 74939521 is about 421.6029466918.

The spelling of 74939521 in words is "seventy-four million, nine hundred thirty-nine thousand, five hundred twenty-one".