235439989891 has 2 divisors, whose sum is σ = 235439989892. Its totient is φ = 235439989890.

The previous prime is 235439989867. The next prime is 235439989921. The reversal of 235439989891 is 198989934532.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 235439989891 - 2³⁵ = 201080251523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 235439989891.

It is not a weakly prime, because it can be changed into another prime (235439989801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 117719994945 + 117719994946.

It is an arithmetic number, because the mean of its divisors is an integer number (117719994946).

Almost surely, 2^235439989891 is an apocalyptic number.

235439989891 is a deficient number, since it is larger than the sum of its proper divisors (1).

235439989891 is an equidigital number, since it uses as much as digits as its factorization.

235439989891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151165440, while the sum is 70.

The spelling of 235439989891 in words is "two hundred thirty-five billion, four hundred thirty-nine million, nine hundred eighty-nine thousand, eight hundred ninety-one".