74736521 has 2 divisors, whose sum is σ = 74736522. Its totient is φ = 74736520.

The previous prime is 74736479. The next prime is 74736523. The reversal of 74736521 is 12563747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74580496 + 156025 = 8636^2 + 395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74736521 is a prime.

It is a super-3 number, since 3×74736521³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

Together with 74736523, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (74736523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37368260 + 37368261.

It is an arithmetic number, because the mean of its divisors is an integer number (37368261).

Almost surely, 2^74736521 is an apocalyptic number.

It is an amenable number.

74736521 is a deficient number, since it is larger than the sum of its proper divisors (1).

74736521 is an equidigital number, since it uses as much as digits as its factorization.

74736521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 35.

The square root of 74736521 is about 8645.0286870548. The cubic root of 74736521 is about 421.2219159046.

It can be divided in two parts, 74736 and 521, that added together give a palindrome (75257).

The spelling of 74736521 in words is "seventy-four million, seven hundred thirty-six thousand, five hundred twenty-one".