74891281 has 2 divisors, whose sum is σ = 74891282. Its totient is φ = 74891280.

The previous prime is 74891263. The next prime is 74891287. The reversal of 74891281 is 18219847.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42458256 + 32433025 = 6516^2 + 5695^2 .

It is a cyclic number.

It is not a de Polignac number, because 74891281 - 2⁷ = 74891153 is a prime.

It is a super-2 number, since 2×74891281² = 11217407939641922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (74891287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37445640 + 37445641.

It is an arithmetic number, because the mean of its divisors is an integer number (37445641).

Almost surely, 2^74891281 is an apocalyptic number.

It is an amenable number.

74891281 is a deficient number, since it is larger than the sum of its proper divisors (1).

74891281 is an equidigital number, since it uses as much as digits as its factorization.

74891281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 40.

The square root of 74891281 is about 8653.9748670770. The cubic root of 74891281 is about 421.5124626524.

It can be divided in two parts, 748 and 91281, that added together give a palindrome (92029).

The spelling of 74891281 in words is "seventy-four million, eight hundred ninety-one thousand, two hundred eighty-one".