131999868 has 360 divisors, whose sum is σ = 479442656. Its totient is φ = 30792960.

The previous prime is 131999807. The next prime is 131999887. The reversal of 131999868 is 868999131.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 3567546 + ... + 3567582.

Almost surely, 2^131999868 is an apocalyptic number.

131999868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131999868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (239721328).

131999868 is an abundant number, since it is smaller than the sum of its proper divisors (347442788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131999868 is a wasteful number, since it uses less digits than its factorization.

131999868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 73 counting only the distinct ones).

The product of its digits is 839808, while the sum is 54.

The square root of 131999868 is about 11489.1195485120. The cubic root of 131999868 is about 509.1641672444.

131999868 divided by its sum of digits (54) gives a palindrome (2444442).

It can be divided in two parts, 131 and 999868, that added together give a palindrome (999999).

The spelling of 131999868 in words is "one hundred thirty-one million, nine hundred ninety-nine thousand, eight hundred sixty-eight".