74249281 has 2 divisors, whose sum is σ = 74249282. Its totient is φ = 74249280.

The previous prime is 74249191. The next prime is 74249291. The reversal of 74249281 is 18294247.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39250225 + 34999056 = 6265^2 + 5916^2 .

It is a cyclic number.

It is not a de Polignac number, because 74249281 - 2¹⁹ = 73724993 is a prime.

It is a super-2 number, since 2×74249281² = 11025911458033922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 74249281.

It is not a weakly prime, because it can be changed into another prime (74249291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37124640 + 37124641.

It is an arithmetic number, because the mean of its divisors is an integer number (37124641).

Almost surely, 2^74249281 is an apocalyptic number.

It is an amenable number.

74249281 is a deficient number, since it is larger than the sum of its proper divisors (1).

74249281 is an equidigital number, since it uses as much as digits as its factorization.

74249281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 37.

The square root of 74249281 is about 8616.8022490945. The cubic root of 74249281 is about 420.3045429163.

The spelling of 74249281 in words is "seventy-four million, two hundred forty-nine thousand, two hundred eighty-one".