154045991 has 16 divisors (see below), whose sum is σ = 172730880. Its totient is φ = 136193280.

The previous prime is 154045981. The next prime is 154046029. The reversal of 154045991 is 199540451.

154045991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 154045991 - 2²⁶ = 86937127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154045981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61730 + ... + 64176.

It is an arithmetic number, because the mean of its divisors is an integer number (10795680).

Almost surely, 2^154045991 is an apocalyptic number.

154045991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

154045991 is a deficient number, since it is larger than the sum of its proper divisors (18684889).

154045991 is a wasteful number, since it uses less digits than its factorization.

154045991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 154045991 is about 12411.5265378599. The cubic root of 154045991 is about 536.0641943887.

The spelling of 154045991 in words is "one hundred fifty-four million, forty-five thousand, nine hundred ninety-one".