45170209 has 6 divisors (see below), whose sum is σ = 52544994. Its totient is φ = 38717280.

The previous prime is 45170189. The next prime is 45170219. The reversal of 45170209 is 90207154.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 39337984 + 5832225 = 6272^2 + 2415^2 .

It is not a de Polignac number, because 45170209 - 2¹¹ = 45168161 is a prime.

It is a super-2 number, since 2×45170209² = 4080695562207362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (45170219) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 460872 + ... + 460969.

It is an arithmetic number, because the mean of its divisors is an integer number (8757499).

Almost surely, 2^45170209 is an apocalyptic number.

45170209 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

45170209 is a deficient number, since it is larger than the sum of its proper divisors (7374785).

45170209 is an equidigital number, since it uses as much as digits as its factorization.

45170209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921855 (or 921848 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 45170209 is about 6720.8785883990. The cubic root of 45170209 is about 356.1372219604.

The spelling of 45170209 in words is "forty-five million, one hundred seventy thousand, two hundred nine".