74857121 has 2 divisors, whose sum is σ = 74857122. Its totient is φ = 74857120.

The previous prime is 74857087. The next prime is 74857141. The reversal of 74857121 is 12175847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58736896 + 16120225 = 7664^2 + 4015^2 .

It is an emirp because it is prime and its reverse (12175847) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74857121 is a prime.

It is not a weakly prime, because it can be changed into another prime (74857141) 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, 37428560 + 37428561.

It is an arithmetic number, because the mean of its divisors is an integer number (37428561).

Almost surely, 2^74857121 is an apocalyptic number.

It is an amenable number.

74857121 is a deficient number, since it is larger than the sum of its proper divisors (1).

74857121 is an equidigital number, since it uses as much as digits as its factorization.

74857121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15680, while the sum is 35.

The square root of 74857121 is about 8652.0009824318. Note that the first 3 decimals coincide. The cubic root of 74857121 is about 421.4483650462.

The spelling of 74857121 in words is "seventy-four million, eight hundred fifty-seven thousand, one hundred twenty-one".