149772209 has 2 divisors, whose sum is σ = 149772210. Its totient is φ = 149772208.

The previous prime is 149772151. The next prime is 149772239. The reversal of 149772209 is 902277941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109411600 + 40360609 = 10460^2 + 6353^2 .

It is a cyclic number.

It is not a de Polignac number, because 149772209 - 2⁸ = 149771953 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (149772239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74886104 + 74886105.

It is an arithmetic number, because the mean of its divisors is an integer number (74886105).

Almost surely, 2^149772209 is an apocalyptic number.

It is an amenable number.

149772209 is a deficient number, since it is larger than the sum of its proper divisors (1).

149772209 is an equidigital number, since it uses as much as digits as its factorization.

149772209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 149772209 is about 12238.1456520177. The cubic root of 149772209 is about 531.0601882636.

The spelling of 149772209 in words is "one hundred forty-nine million, seven hundred seventy-two thousand, two hundred nine".