74173681 has 2 divisors, whose sum is σ = 74173682. Its totient is φ = 74173680.

The previous prime is 74173651. The next prime is 74173691. The reversal of 74173681 is 18637147.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37933281 + 36240400 = 6159^2 + 6020^2 .

It is a cyclic number.

It is not a de Polignac number, because 74173681 - 2¹¹ = 74171633 is a prime.

It is a super-2 number, since 2×74173681² = 11003469906179522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74173681.

It is not a weakly prime, because it can be changed into another prime (74173651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37086840 + 37086841.

It is an arithmetic number, because the mean of its divisors is an integer number (37086841).

Almost surely, 2^74173681 is an apocalyptic number.

It is an amenable number.

74173681 is a deficient number, since it is larger than the sum of its proper divisors (1).

74173681 is an equidigital number, since it uses as much as digits as its factorization.

74173681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28224, while the sum is 37.

The square root of 74173681 is about 8612.4143537106. The cubic root of 74173681 is about 420.1618442779.

It can be divided in two parts, 74 and 173681, that added together give a triangular number (173755 = T₅₈₉).

The spelling of 74173681 in words is "seventy-four million, one hundred seventy-three thousand, six hundred eighty-one".