243142891 has 16 divisors (see below), whose sum is σ = 265348224. Its totient is φ = 221906944.

The previous prime is 243142883. The next prime is 243142903. The reversal of 243142891 is 198241342.

It is a cyclic number.

It is not a de Polignac number, because 243142891 - 2³ = 243142883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243142871) 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, 88941 + ... + 91633.

It is an arithmetic number, because the mean of its divisors is an integer number (16584264).

Almost surely, 2^243142891 is an apocalyptic number.

243142891 is a deficient number, since it is larger than the sum of its proper divisors (22205333).

243142891 is a wasteful number, since it uses less digits than its factorization.

243142891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2870.

The product of its digits is 13824, while the sum is 34.

The square root of 243142891 is about 15593.0398255119. The cubic root of 243142891 is about 624.1474378693.

The spelling of 243142891 in words is "two hundred forty-three million, one hundred forty-two thousand, eight hundred ninety-one".