45509749 has 2 divisors, whose sum is σ = 45509750. Its totient is φ = 45509748.

The previous prime is 45509707. The next prime is 45509759. The reversal of 45509749 is 94790554.

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., 45131524 + 378225 = 6718^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 45509749 - 2¹⁹ = 44985461 is a prime.

It is a super-2 number, since 2×45509749² = 4142274508086002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45509759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22754874 + 22754875.

It is an arithmetic number, because the mean of its divisors is an integer number (22754875).

Almost surely, 2^45509749 is an apocalyptic number.

It is an amenable number.

45509749 is a deficient number, since it is larger than the sum of its proper divisors (1).

45509749 is an equidigital number, since it uses as much as digits as its factorization.

45509749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 45509749 is about 6746.0913868699. The cubic root of 45509749 is about 357.0273447919.

The spelling of 45509749 in words is "forty-five million, five hundred nine thousand, seven hundred forty-nine".