154111997 has 8 divisors (see below), whose sum is σ = 166569816. Its totient is φ = 141740352.

The previous prime is 154111981. The next prime is 154112011. The reversal of 154111997 is 799111451.

It can be written as a sum of positive squares in 4 ways, for example, as 15202201 + 138909796 = 3899^2 + 11786^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 154111997 - 2⁴ = 154111981 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 154111997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154111927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17798 + ... + 24999.

It is an arithmetic number, because the mean of its divisors is an integer number (20821227).

Almost surely, 2^154111997 is an apocalyptic number.

It is an amenable number.

154111997 is a deficient number, since it is larger than the sum of its proper divisors (12457819).

154111997 is a wasteful number, since it uses less digits than its factorization.

154111997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43087.

The product of its digits is 11340, while the sum is 38.

The square root of 154111997 is about 12414.1853135838. The cubic root of 154111997 is about 536.1407481513.

The spelling of 154111997 in words is "one hundred fifty-four million, one hundred eleven thousand, nine hundred ninety-seven".