149136569 has 4 divisors (see below), whose sum is σ = 149162100. Its totient is φ = 149111040.

The previous prime is 149136539. The next prime is 149136583. The reversal of 149136569 is 965631941.

149136569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 965631941 = 283 ⋅3412127.

It can be written as a sum of positive squares in 2 ways, for example, as 93857344 + 55279225 = 9688^2 + 7435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-149136569 is a prime.

It is a super-2 number, since 2×149136569² = 44483432426183522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149136539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 809 + ... + 17289.

It is an arithmetic number, because the mean of its divisors is an integer number (37290525).

Almost surely, 2^149136569 is an apocalyptic number.

It is an amenable number.

149136569 is a deficient number, since it is larger than the sum of its proper divisors (25531).

149136569 is an equidigital number, since it uses as much as digits as its factorization.

149136569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25530.

The product of its digits is 174960, while the sum is 44.

The square root of 149136569 is about 12212.1484186854. The cubic root of 149136569 is about 530.3078418084.

The spelling of 149136569 in words is "one hundred forty-nine million, one hundred thirty-six thousand, five hundred sixty-nine".