45939209 has 2 divisors, whose sum is σ = 45939210. Its totient is φ = 45939208.

The previous prime is 45939193. The next prime is 45939217. The reversal of 45939209 is 90293954.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40921609 + 5017600 = 6397^2 + 2240^2 .

It is a cyclic number.

It is not a de Polignac number, because 45939209 - 2⁴ = 45939193 is a prime.

It is a super-2 number, since 2×45939209² = 4220821847091362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (45939239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22969604 + 22969605.

It is an arithmetic number, because the mean of its divisors is an integer number (22969605).

Almost surely, 2^45939209 is an apocalyptic number.

It is an amenable number.

45939209 is a deficient number, since it is larger than the sum of its proper divisors (1).

45939209 is an equidigital number, since it uses as much as digits as its factorization.

45939209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 45939209 is about 6777.8469295197. The cubic root of 45939209 is about 358.1468790688.

The spelling of 45939209 in words is "forty-five million, nine hundred thirty-nine thousand, two hundred nine".