74649569 has 2 divisors, whose sum is σ = 74649570. Its totient is φ = 74649568.

The previous prime is 74649557. The next prime is 74649571. The reversal of 74649569 is 96594647.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74166544 + 483025 = 8612^2 + 695^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74649569 is a prime.

It is a super-2 number, since 2×74649569² = 11145116303771522, which contains 22 as substring.

Together with 74649571, 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 (74649529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37324784 + 37324785.

It is an arithmetic number, because the mean of its divisors is an integer number (37324785).

Almost surely, 2^74649569 is an apocalyptic number.

It is an amenable number.

74649569 is a deficient number, since it is larger than the sum of its proper divisors (1).

74649569 is an equidigital number, since it uses as much as digits as its factorization.

74649569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The square root of 74649569 is about 8639.9982060183. The cubic root of 74649569 is about 421.0584960178.

The spelling of 74649569 in words is "seventy-four million, six hundred forty-nine thousand, five hundred sixty-nine".