749390581 has 2 divisors, whose sum is σ = 749390582. Its totient is φ = 749390580.

The previous prime is 749390567. The next prime is 749390671. The reversal of 749390581 is 185093947.

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., 395612100 + 353778481 = 19890^2 + 18809^2 .

It is a cyclic number.

It is not a de Polignac number, because 749390581 - 2¹⁵ = 749357813 is a prime.

It is a super-2 number, since 2×749390581² = 1123172485783035122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (749300581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 374695290 + 374695291.

It is an arithmetic number, because the mean of its divisors is an integer number (374695291).

Almost surely, 2^749390581 is an apocalyptic number.

It is an amenable number.

749390581 is a deficient number, since it is larger than the sum of its proper divisors (1).

749390581 is an equidigital number, since it uses as much as digits as its factorization.

749390581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 749390581 is about 27374.9991963470. Note that the first 3 decimals coincide. The cubic root of 749390581 is about 908.3141435518.

The spelling of 749390581 in words is "seven hundred forty-nine million, three hundred ninety thousand, five hundred eighty-one".