231678661 has 4 divisors (see below), whose sum is σ = 231709824. Its totient is φ = 231647500.

The previous prime is 231678653. The next prime is 231678673. The reversal of 231678661 is 166876132.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 231678661 - 2³ = 231678653 is a prime.

It is a super-3 number, since 3×231678661³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231678611) 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, 2796 + ... + 21706.

It is an arithmetic number, because the mean of its divisors is an integer number (57927456).

Almost surely, 2^231678661 is an apocalyptic number.

It is an amenable number.

231678661 is a deficient number, since it is larger than the sum of its proper divisors (31163).

231678661 is a wasteful number, since it uses less digits than its factorization.

231678661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31162.

The product of its digits is 72576, while the sum is 40.

The square root of 231678661 is about 15220.9940871153. The cubic root of 231678661 is about 614.1795400288.

The spelling of 231678661 in words is "two hundred thirty-one million, six hundred seventy-eight thousand, six hundred sixty-one".