149535981 has 24 divisors (see below), whose sum is σ = 253528704. Its totient is φ = 83138400.

The previous prime is 149535973. The next prime is 149535989. The reversal of 149535981 is 189535941.

149535981 is a `hidden beast` number, since 1 + 4 + 9 + 53 + 598 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (149535973) and next prime (149535989).

It is not a de Polignac number, because 149535981 - 2³ = 149535973 is a prime.

It is a super-2 number, since 2×149535981² = 44722019227264722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149535989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29745 + ... + 34406.

It is an arithmetic number, because the mean of its divisors is an integer number (10563696).

Almost surely, 2^149535981 is an apocalyptic number.

It is an amenable number.

149535981 is a deficient number, since it is larger than the sum of its proper divisors (103992723).

149535981 is a wasteful number, since it uses less digits than its factorization.

149535981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64201 (or 64198 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 149535981 is about 12228.4905446257. The cubic root of 149535981 is about 530.7808367052.

It can be divided in two parts, 149 and 535981, that added together give a triangular number (536130 = T₁₀₃₅).

The spelling of 149535981 in words is "one hundred forty-nine million, five hundred thirty-five thousand, nine hundred eighty-one".