131011820 has 24 divisors (see below), whose sum is σ = 282562224. Its totient is φ = 50988096.

The previous prime is 131011817. The next prime is 131011871. The reversal of 131011820 is 28110131.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87782 + ... + 89261.

It is an arithmetic number, because the mean of its divisors is an integer number (11773426).

Almost surely, 2^131011820 is an apocalyptic number.

131011820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131011820 is an abundant number, since it is smaller than the sum of its proper divisors (151550404).

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

131011820 is a wasteful number, since it uses less digits than its factorization.

131011820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177089 (or 177087 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 17.

The square root of 131011820 is about 11446.0394897100. The cubic root of 131011820 is about 507.8905823822.

Adding to 131011820 its reverse (28110131), we get a palindrome (159121951).

The spelling of 131011820 in words is "one hundred thirty-one million, eleven thousand, eight hundred twenty".