74965921 has 2 divisors, whose sum is σ = 74965922. Its totient is φ = 74965920.

The previous prime is 74965909. The next prime is 74965927. The reversal of 74965921 is 12956947.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54390625 + 20575296 = 7375^2 + 4536^2 .

It is an emirp because it is prime and its reverse (12956947) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74965921 - 2²¹ = 72868769 is a prime.

It is a super-2 number, since 2×74965921² = 11239778622756482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (74965927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37482960 + 37482961.

It is an arithmetic number, because the mean of its divisors is an integer number (37482961).

Almost surely, 2^74965921 is an apocalyptic number.

It is an amenable number.

74965921 is a deficient number, since it is larger than the sum of its proper divisors (1).

74965921 is an equidigital number, since it uses as much as digits as its factorization.

74965921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 74965921 is about 8658.2862623039. The cubic root of 74965921 is about 421.6524488810.

The spelling of 74965921 in words is "seventy-four million, nine hundred sixty-five thousand, nine hundred twenty-one".