149428981 has 4 divisors (see below), whose sum is σ = 160923532. Its totient is φ = 137934432.

The previous prime is 149428927. The next prime is 149429011. The reversal of 149428981 is 189824941.

149428981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189824941 = 17 ⋅11166173.

It can be written as a sum of positive squares in 2 ways, for example, as 99500625 + 49928356 = 9975^2 + 7066^2 .

It is a cyclic number.

It is not a de Polignac number, because 149428981 - 2²¹ = 147331829 is a prime.

It is a super-2 number, since 2×149428981² = 44658040725396722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149428921) 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, 5747256 + ... + 5747281.

It is an arithmetic number, because the mean of its divisors is an integer number (40230883).

Almost surely, 2^149428981 is an apocalyptic number.

It is an amenable number.

149428981 is a deficient number, since it is larger than the sum of its proper divisors (11494551).

149428981 is a wasteful number, since it uses less digits than its factorization.

149428981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11494550.

The product of its digits is 165888, while the sum is 46.

The square root of 149428981 is about 12224.1147327731. The cubic root of 149428981 is about 530.6542069788.

The spelling of 149428981 in words is "one hundred forty-nine million, four hundred twenty-eight thousand, nine hundred eighty-one".