231542811 has 6 divisors (see below), whose sum is σ = 334450740. Its totient is φ = 154361868.

The previous prime is 231542809. The next prime is 231542827. The reversal of 231542811 is 118245132.

231542811 is a `hidden beast` number, since 231 + 5 + 428 + 1 + 1 = 666.

It is not a de Polignac number, because 231542811 - 2¹ = 231542809 is a prime.

It is a super-2 number, since 2×231542811² = 107224146651563442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231542881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12863481 + ... + 12863498.

It is an arithmetic number, because the mean of its divisors is an integer number (55741790).

Almost surely, 2^231542811 is an apocalyptic number.

231542811 is a deficient number, since it is larger than the sum of its proper divisors (102907929).

231542811 is a wasteful number, since it uses less digits than its factorization.

231542811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25726985 (or 25726982 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 231542811 is about 15216.5308464183. The cubic root of 231542811 is about 614.0594705559.

Adding to 231542811 its reverse (118245132), we get a palindrome (349787943).

The spelling of 231542811 in words is "two hundred thirty-one million, five hundred forty-two thousand, eight hundred eleven".