154999969 has 4 divisors (see below), whose sum is σ = 160000000. Its totient is φ = 149999940.

The previous prime is 154999961. The next prime is 154999973. The reversal of 154999969 is 969999451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 154999969 - 2³ = 154999961 is a prime.

It is a super-2 number, since 2×154999969² = 48049980780001922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154999961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2499969 + ... + 2500030.

It is an arithmetic number, because the mean of its divisors is an integer number (40000000).

Almost surely, 2^154999969 is an apocalyptic number.

It is an amenable number.

154999969 is a deficient number, since it is larger than the sum of its proper divisors (5000031).

154999969 is an equidigital number, since it uses as much as digits as its factorization.

154999969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5000030.

The product of its digits is 7085880, while the sum is 61.

The square root of 154999969 is about 12449.8983529987. The cubic root of 154999969 is about 537.1684996832.

The spelling of 154999969 in words is "one hundred fifty-four million, nine hundred ninety-nine thousand, nine hundred sixty-nine".