74979997 has 2 divisors, whose sum is σ = 74979998. Its totient is φ = 74979996.

The previous prime is 74979991. The next prime is 74980027. The reversal of 74979997 is 79997947.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73513476 + 1466521 = 8574^2 + 1211^2 .

It is an emirp because it is prime and its reverse (79997947) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74979997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74979991) 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, 37489998 + 37489999.

It is an arithmetic number, because the mean of its divisors is an integer number (37489999).

Almost surely, 2^74979997 is an apocalyptic number.

It is an amenable number.

74979997 is a deficient number, since it is larger than the sum of its proper divisors (1).

74979997 is an equidigital number, since it uses as much as digits as its factorization.

74979997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9001692, while the sum is 61.

The square root of 74979997 is about 8659.0990870875. The cubic root of 74979997 is about 421.6788377982.

The spelling of 74979997 in words is "seventy-four million, nine hundred seventy-nine thousand, nine hundred ninety-seven".