154539891 has 24 divisors (see below), whose sum is σ = 248120496. Its totient is φ = 91890240.

The previous prime is 154539887. The next prime is 154539907. The reversal of 154539891 is 198935451.

It is not a de Polignac number, because 154539891 - 2² = 154539887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (154539841) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9480 + ... + 19973.

It is an arithmetic number, because the mean of its divisors is an integer number (10338354).

Almost surely, 2^154539891 is an apocalyptic number.

154539891 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

154539891 is a deficient number, since it is larger than the sum of its proper divisors (93580605).

154539891 is a wasteful number, since it uses less digits than its factorization.

154539891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29523 (or 29520 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 154539891 is about 12431.4074424419. The cubic root of 154539891 is about 536.6364902510.

It can be divided in two parts, 154 and 539891, that added together give a palindrome (540045).

The spelling of 154539891 in words is "one hundred fifty-four million, five hundred thirty-nine thousand, eight hundred ninety-one".