45981209 has 12 divisors (see below), whose sum is σ = 50904756. Its totient is φ = 41386752.

The previous prime is 45981137. The next prime is 45981223. The reversal of 45981209 is 90218954.

It can be written as a sum of positive squares in 2 ways, for example, as 14227984 + 31753225 = 3772^2 + 5635^2 .

It is not a de Polignac number, because 45981209 - 2¹⁶ = 45915673 is a prime.

It is a super-2 number, since 2×45981209² = 4228543162203362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45981109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6437 + ... + 11549.

It is an arithmetic number, because the mean of its divisors is an integer number (4242063).

Almost surely, 2^45981209 is an apocalyptic number.

It is an amenable number.

45981209 is a deficient number, since it is larger than the sum of its proper divisors (4923547).

45981209 is a wasteful number, since it uses less digits than its factorization.

45981209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5176 (or 5153 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 45981209 is about 6780.9445507245. The cubic root of 45981209 is about 358.2559912881.

The spelling of 45981209 in words is "forty-five million, nine hundred eighty-one thousand, two hundred nine".