149280121 has 4 divisors (see below), whose sum is σ = 150758244. Its totient is φ = 147802000.

The previous prime is 149280113. The next prime is 149280137. The reversal of 149280121 is 121082941.

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 145805625 + 3474496 = 12075^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 149280121 - 2³ = 149280113 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 149280121.

It is not an unprimeable number, because it can be changed into a prime (149280101) 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, 738910 + ... + 739111.

It is an arithmetic number, because the mean of its divisors is an integer number (37689561).

Almost surely, 2^149280121 is an apocalyptic number.

It is an amenable number.

149280121 is a deficient number, since it is larger than the sum of its proper divisors (1478123).

149280121 is a wasteful number, since it uses less digits than its factorization.

149280121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478122.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 149280121 is about 12218.0244311427. The cubic root of 149280121 is about 530.4779372217.

The spelling of 149280121 in words is "one hundred forty-nine million, two hundred eighty thousand, one hundred twenty-one".