74781617 has 2 divisors, whose sum is σ = 74781618. Its totient is φ = 74781616.

The previous prime is 74781611. The next prime is 74781661. The reversal of 74781617 is 71618747.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70291456 + 4490161 = 8384^2 + 2119^2 .

It is an emirp because it is prime and its reverse (71618747) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74781617 - 2⁸ = 74781361 is a prime.

It is a super-2 number, since 2×74781617² = 11184580482269378, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74781611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37390808 + 37390809.

It is an arithmetic number, because the mean of its divisors is an integer number (37390809).

Almost surely, 2^74781617 is an apocalyptic number.

It is an amenable number.

74781617 is a deficient number, since it is larger than the sum of its proper divisors (1).

74781617 is an equidigital number, since it uses as much as digits as its factorization.

74781617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 65856, while the sum is 41.

The square root of 74781617 is about 8647.6364979109. The cubic root of 74781617 is about 421.3066206064.

The spelling of 74781617 in words is "seventy-four million, seven hundred eighty-one thousand, six hundred seventeen".