149999999 has 4 divisors (see below), whose sum is σ = 150117480. Its totient is φ = 149882520.

The previous prime is 149999957. The next prime is 150000001. The reversal of 149999999 is 999999941.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 149999999 - 2²⁰ = 148951423 is a prime.

It is a fibodiv number, since the Fibonacci-like sequence with seeds 1 and 49999999 contains 149999999 itself.

149999999 is a modest number, since divided by 99999 gives 1499 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (149999909) 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, 56804 + ... + 59385.

It is an arithmetic number, because the mean of its divisors is an integer number (37529370).

Almost surely, 2^149999999 is an apocalyptic number.

149999999 is a deficient number, since it is larger than the sum of its proper divisors (117481).

149999999 is a wasteful number, since it uses less digits than its factorization.

149999999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117480.

The product of its digits is 19131876, while the sum is 68.

The square root of 149999999 is about 12247.4486730911. The cubic root of 149999999 is about 531.3292834106.

The spelling of 149999999 in words is "one hundred forty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".