131111020 has 48 divisors (see below), whose sum is σ = 292894560. Its totient is φ = 49158144.

The previous prime is 131111011. The next prime is 131111081. The reversal of 131111020 is 20111131.

131111020 = T₃₇₃ + T₃₇₄ + ... + T₉₄₂.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 131110988 and 131111006.

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 15 ways as a sum of consecutive naturals, for example, 35082 + ... + 38638.

It is an arithmetic number, because the mean of its divisors is an integer number (6101970).

Almost surely, 2^131111020 is an apocalyptic number.

131111020 is a gapful number since it is divisible by the number (10) 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 131111020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146447280).

131111020 is an abundant number, since it is smaller than the sum of its proper divisors (161783540).

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

131111020 is a wasteful number, since it uses less digits than its factorization.

131111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3682 (or 3680 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 131111020 is about 11450.3720463573. The cubic root of 131111020 is about 508.0187388462.

Adding to 131111020 its reverse (20111131), we get a palindrome (151222151).

The spelling of 131111020 in words is "one hundred thirty-one million, one hundred eleven thousand, twenty".