154642891 has 4 divisors (see below), whose sum is σ = 166538512. Its totient is φ = 142747272.

The previous prime is 154642889. The next prime is 154642903. The reversal of 154642891 is 198246451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198246451 = 13 ⋅15249727.

It is a cyclic number.

It is not a de Polignac number, because 154642891 - 2¹ = 154642889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154642841) 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, 5947791 + ... + 5947816.

It is an arithmetic number, because the mean of its divisors is an integer number (41634628).

Almost surely, 2^154642891 is an apocalyptic number.

154642891 is a deficient number, since it is larger than the sum of its proper divisors (11895621).

154642891 is a wasteful number, since it uses less digits than its factorization.

154642891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11895620.

The product of its digits is 69120, while the sum is 40.

The square root of 154642891 is about 12435.5494852459. The cubic root of 154642891 is about 536.7556855449.

The spelling of 154642891 in words is "one hundred fifty-four million, six hundred forty-two thousand, eight hundred ninety-one".