149956561 has 4 divisors (see below), whose sum is σ = 150733732. Its totient is φ = 149179392.

The previous prime is 149956559. The next prime is 149956603. The reversal of 149956561 is 165659941.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67963536 + 81993025 = 8244^2 + 9055^2 .

It is a cyclic number.

It is not a de Polignac number, because 149956561 - 2¹ = 149956559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149956861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388296 + ... + 388681.

It is an arithmetic number, because the mean of its divisors is an integer number (37683433).

Almost surely, 2^149956561 is an apocalyptic number.

It is an amenable number.

149956561 is a deficient number, since it is larger than the sum of its proper divisors (777171).

149956561 is an equidigital number, since it uses as much as digits as its factorization.

149956561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777170.

The product of its digits is 291600, while the sum is 46.

The square root of 149956561 is about 12245.6751957579. The cubic root of 149956561 is about 531.2779898332.

The spelling of 149956561 in words is "one hundred forty-nine million, nine hundred fifty-six thousand, five hundred sixty-one".