149451561 has 28 divisors (see below), whose sum is σ = 256094272. Its totient is φ = 85397976.

The previous prime is 149451557. The next prime is 149451563. The reversal of 149451561 is 165154941.

149451561 is a `hidden beast` number, since 1 + 4 + 94 + 5 + 1 + 561 = 666.

It is not a de Polignac number, because 149451561 - 2² = 149451557 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (149451563) 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 27 ways as a sum of consecutive naturals, for example, 9541 + ... + 19746.

It is an arithmetic number, because the mean of its divisors is an integer number (9146224).

Almost surely, 2^149451561 is an apocalyptic number.

It is an amenable number.

149451561 is a deficient number, since it is larger than the sum of its proper divisors (106642711).

149451561 is an frugal number, since it uses more digits than its factorization.

149451561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29312 (or 29297 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 149451561 is about 12225.0382821486. The cubic root of 149451561 is about 530.6809344325.

The spelling of 149451561 in words is "one hundred forty-nine million, four hundred fifty-one thousand, five hundred sixty-one".