131221794 has 64 divisors (see below), whose sum is σ = 293529600. Its totient is φ = 38776320.

The previous prime is 131221789. The next prime is 131221801. The reversal of 131221794 is 497122131.

It is a Curzon number.

It is a nialpdrome in base 8.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 659307 + ... + 659505.

It is an arithmetic number, because the mean of its divisors is an integer number (4586400).

Almost surely, 2^131221794 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 131221794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146764800).

131221794 is an abundant number, since it is smaller than the sum of its proper divisors (162307806).

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

131221794 is a wasteful number, since it uses less digits than its factorization.

131221794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415.

The product of its digits is 3024, while the sum is 30.

The square root of 131221794 is about 11455.2081604832. The cubic root of 131221794 is about 508.1617713858.

The spelling of 131221794 in words is "one hundred thirty-one million, two hundred twenty-one thousand, seven hundred ninety-four".