231193861 has 4 divisors (see below), whose sum is σ = 241245792. Its totient is φ = 221141932.

The previous prime is 231193817. The next prime is 231193867. The reversal of 231193861 is 168391132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231193861 - 2¹⁹ = 230669573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231193867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5025931 + ... + 5025976.

It is an arithmetic number, because the mean of its divisors is an integer number (60311448).

Almost surely, 2^231193861 is an apocalyptic number.

It is an amenable number.

231193861 is a deficient number, since it is larger than the sum of its proper divisors (10051931).

231193861 is a wasteful number, since it uses less digits than its factorization.

231193861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10051930.

The product of its digits is 7776, while the sum is 34.

The square root of 231193861 is about 15205.0603747568. The cubic root of 231193861 is about 613.7508396751.

The spelling of 231193861 in words is "two hundred thirty-one million, one hundred ninety-three thousand, eight hundred sixty-one".