131993866 has 4 divisors (see below), whose sum is σ = 197990802. Its totient is φ = 65996932.

The previous prime is 131993857. The next prime is 131993867. The reversal of 131993866 is 668399131.

131993866 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 129481641 + 2512225 = 11379^2 + 1585^2 .

It is a super-3 number, since 3×131993866³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (131993867) 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 as a sum of consecutive naturals, namely, 32998465 + ... + 32998468.

Almost surely, 2^131993866 is an apocalyptic number.

131993866 is a deficient number, since it is larger than the sum of its proper divisors (65996936).

131993866 is an equidigital number, since it uses as much as digits as its factorization.

131993866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65996935.

The product of its digits is 209952, while the sum is 46.

The square root of 131993866 is about 11488.8583418893. The cubic root of 131993866 is about 509.1564499396.

The spelling of 131993866 in words is "one hundred thirty-one million, nine hundred ninety-three thousand, eight hundred sixty-six".