231377681 has 4 divisors (see below), whose sum is σ = 231449652. Its totient is φ = 231305712.

The previous prime is 231377659. The next prime is 231377683. The reversal of 231377681 is 186773132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 143017681 + 88360000 = 11959^2 + 9400^2 .

It is a cyclic number.

It is not a de Polignac number, because 231377681 - 2¹⁰ = 231376657 is a prime.

It is a super-2 number, since 2×231377681² = 107071262529875522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231377683) 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 3 ways as a sum of consecutive naturals, for example, 30926 + ... + 37671.

It is an arithmetic number, because the mean of its divisors is an integer number (57862413).

Almost surely, 2^231377681 is an apocalyptic number.

It is an amenable number.

231377681 is a deficient number, since it is larger than the sum of its proper divisors (71971).

231377681 is an equidigital number, since it uses as much as digits as its factorization.

231377681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71970.

The product of its digits is 42336, while the sum is 38.

The square root of 231377681 is about 15211.1038718431. The cubic root of 231377681 is about 613.9134590334.

The spelling of 231377681 in words is "two hundred thirty-one million, three hundred seventy-seven thousand, six hundred eighty-one".