149289921 has 18 divisors (see below), whose sum is σ = 237028610. Its totient is φ = 90478080.

The previous prime is 149289919. The next prime is 149289967. The reversal of 149289921 is 129982941.

It can be written as a sum of positive squares in only one way, i.e., 98010000 + 51279921 = 9900^2 + 7161^2 .

It is not a de Polignac number, because 149289921 - 2¹ = 149289919 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (149289901) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 67456 + ... + 69633.

Almost surely, 2^149289921 is an apocalyptic number.

149289921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

149289921 is a deficient number, since it is larger than the sum of its proper divisors (87738689).

149289921 is a wasteful number, since it uses less digits than its factorization.

149289921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137117 (or 137103 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 149289921 is about 12218.4254713936. The cubic root of 149289921 is about 530.4895453089.

The spelling of 149289921 in words is "one hundred forty-nine million, two hundred eighty-nine thousand, nine hundred twenty-one".