231402811 has 8 divisors (see below), whose sum is σ = 238644000. Its totient is φ = 224237760.

The previous prime is 231402781. The next prime is 231402833. The reversal of 231402811 is 118204132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231402811 - 2⁹ = 231402299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231402851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12831 + ... + 25048.

It is an arithmetic number, because the mean of its divisors is an integer number (29830500).

Almost surely, 2^231402811 is an apocalyptic number.

231402811 is a deficient number, since it is larger than the sum of its proper divisors (7241189).

231402811 is a wasteful number, since it uses less digits than its factorization.

231402811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38069.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 231402811 is about 15211.9298907141. The cubic root of 231402811 is about 613.9356840044.

Adding to 231402811 its reverse (118204132), we get a palindrome (349606943).

The spelling of 231402811 in words is "two hundred thirty-one million, four hundred two thousand, eight hundred eleven".