131121830 has 64 divisors (see below), whose sum is σ = 276756480. Its totient is φ = 43804800.

The previous prime is 131121829. The next prime is 131121871. The reversal of 131121830 is 38121131.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 724340 + ... + 724520.

It is an arithmetic number, because the mean of its divisors is an integer number (4324320).

Almost surely, 2^131121830 is an apocalyptic number.

131121830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

131121830 is an abundant number, since it is smaller than the sum of its proper divisors (145634650).

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

131121830 is a wasteful number, since it uses less digits than its factorization.

131121830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 131121830 is about 11450.8440736917. The cubic root of 131121830 is about 508.0327003771.

Adding to 131121830 its reverse (38121131), we get a palindrome (169242961).

The spelling of 131121830 in words is "one hundred thirty-one million, one hundred twenty-one thousand, eight hundred thirty".