149889961 has 4 divisors (see below), whose sum is σ = 161419972. Its totient is φ = 138359952.

The previous prime is 149889953. The next prime is 149889967. The reversal of 149889961 is 169988941.

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 24561936 + 125328025 = 4956^2 + 11195^2 .

It is a cyclic number.

It is not a de Polignac number, because 149889961 - 2³ = 149889953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (149889967) 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, 5764986 + ... + 5765011.

It is an arithmetic number, because the mean of its divisors is an integer number (40354993).

Almost surely, 2^149889961 is an apocalyptic number.

It is an amenable number.

149889961 is a deficient number, since it is larger than the sum of its proper divisors (11530011).

149889961 is a wasteful number, since it uses less digits than its factorization.

149889961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11530010.

The product of its digits is 1119744, while the sum is 55.

The square root of 149889961 is about 12242.9555663655. The cubic root of 149889961 is about 531.1993262669.

The spelling of 149889961 in words is "one hundred forty-nine million, eight hundred eighty-nine thousand, nine hundred sixty-one".