149645569 has 2 divisors, whose sum is σ = 149645570. Its totient is φ = 149645568.

The previous prime is 149645557. The next prime is 149645647. The reversal of 149645569 is 965546941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96530625 + 53114944 = 9825^2 + 7288^2 .

It is an emirp because it is prime and its reverse (965546941) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 149645569 - 2⁵ = 149645537 is a prime.

It is a super-2 number, since 2×149645569² = 44787592642667522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (149645269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74822784 + 74822785.

It is an arithmetic number, because the mean of its divisors is an integer number (74822785).

Almost surely, 2^149645569 is an apocalyptic number.

It is an amenable number.

149645569 is a deficient number, since it is larger than the sum of its proper divisors (1).

149645569 is an equidigital number, since it uses as much as digits as its factorization.

149645569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1166400, while the sum is 49.

The square root of 149645569 is about 12232.9705713698. The cubic root of 149645569 is about 530.9104666140.

The spelling of 149645569 in words is "one hundred forty-nine million, six hundred forty-five thousand, five hundred sixty-nine".