154979899 has 4 divisors (see below), whose sum is σ = 155020264. Its totient is φ = 154939536.

The previous prime is 154979893. The next prime is 154979917. The reversal of 154979899 is 998979451.

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 154979899 - 2⁷ = 154979771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154979893) 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, 13737 + ... + 22330.

It is an arithmetic number, because the mean of its divisors is an integer number (38755066).

Almost surely, 2^154979899 is an apocalyptic number.

154979899 is a deficient number, since it is larger than the sum of its proper divisors (40365).

154979899 is an equidigital number, since it uses as much as digits as its factorization.

154979899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40364.

The product of its digits is 7348320, while the sum is 61.

The square root of 154979899 is about 12449.0922962279. The cubic root of 154979899 is about 537.1453137923.

The spelling of 154979899 in words is "one hundred fifty-four million, nine hundred seventy-nine thousand, eight hundred ninety-nine".