149784561 has 12 divisors (see below), whose sum is σ = 216478080. Its totient is φ = 99799800.

The previous prime is 149784517. The next prime is 149784571. The reversal of 149784561 is 165487941.

149784561 is a `hidden beast` number, since 1 + 4 + 9 + 7 + 84 + 561 = 666.

It is not a de Polignac number, because 149784561 - 2¹⁹ = 149260273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (149784571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17620 + ... + 24698.

It is an arithmetic number, because the mean of its divisors is an integer number (18039840).

Almost surely, 2^149784561 is an apocalyptic number.

It is an amenable number.

149784561 is a deficient number, since it is larger than the sum of its proper divisors (66693519).

149784561 is a wasteful number, since it uses less digits than its factorization.

149784561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9436 (or 9433 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 149784561 is about 12238.6502932309. The cubic root of 149784561 is about 531.0747870447.

The spelling of 149784561 in words is "one hundred forty-nine million, seven hundred eighty-four thousand, five hundred sixty-one".