231845681 has 4 divisors (see below), whose sum is σ = 241925952. Its totient is φ = 221765412.

The previous prime is 231845651. The next prime is 231845707. The reversal of 231845681 is 186548132.

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 a de Polignac number, because none of the positive numbers 2^k-231845681 is a prime.

It is a super-2 number, since 2×231845681² = 107504839596707522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231845641) 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, 5040101 + ... + 5040146.

It is an arithmetic number, because the mean of its divisors is an integer number (60481488).

Almost surely, 2^231845681 is an apocalyptic number.

It is an amenable number.

231845681 is a deficient number, since it is larger than the sum of its proper divisors (10080271).

231845681 is a wasteful number, since it uses less digits than its factorization.

231845681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10080270.

The product of its digits is 46080, while the sum is 38.

The square root of 231845681 is about 15226.4795996974. The cubic root of 231845681 is about 614.3270944413.

The spelling of 231845681 in words is "two hundred thirty-one million, eight hundred forty-five thousand, six hundred eighty-one".