154755991 has 4 divisors (see below), whose sum is σ = 166660312. Its totient is φ = 142851672.

The previous prime is 154755971. The next prime is 154756001. The reversal of 154755991 is 199557451.

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 154755991 - 2²³ = 146367383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154755901) 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, 5952141 + ... + 5952166.

It is an arithmetic number, because the mean of its divisors is an integer number (41665078).

Almost surely, 2^154755991 is an apocalyptic number.

154755991 is a deficient number, since it is larger than the sum of its proper divisors (11904321).

154755991 is a wasteful number, since it uses less digits than its factorization.

154755991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11904320.

The product of its digits is 283500, while the sum is 46.

The square root of 154755991 is about 12440.0961009150. The cubic root of 154755991 is about 536.8865079708.

The spelling of 154755991 in words is "one hundred fifty-four million, seven hundred fifty-five thousand, nine hundred ninety-one".