154591891 has 2 divisors, whose sum is σ = 154591892. Its totient is φ = 154591890.

The previous prime is 154591889. The next prime is 154591903. The reversal of 154591891 is 198195451.

154591891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 154591891 - 2¹ = 154591889 is a prime.

Together with 154591889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (154591691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77295945 + 77295946.

It is an arithmetic number, because the mean of its divisors is an integer number (77295946).

Almost surely, 2^154591891 is an apocalyptic number.

154591891 is a deficient number, since it is larger than the sum of its proper divisors (1).

154591891 is an equidigital number, since it uses as much as digits as its factorization.

154591891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 43.

The square root of 154591891 is about 12433.4987433144. The cubic root of 154591891 is about 536.6966731333.

The spelling of 154591891 in words is "one hundred fifty-four million, five hundred ninety-one thousand, eight hundred ninety-one".