131121109 has 12 divisors (see below), whose sum is σ = 160557600. Its totient is φ = 106473528.

The previous prime is 131121031. The next prime is 131121113. The reversal of 131121109 is 901121131.

It is not a de Polignac number, because 131121109 - 2¹⁵ = 131088341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131121149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69489 + ... + 71350.

It is an arithmetic number, because the mean of its divisors is an integer number (13379800).

Almost surely, 2^131121109 is an apocalyptic number.

131121109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

131121109 is a deficient number, since it is larger than the sum of its proper divisors (29436491).

131121109 is a wasteful number, since it uses less digits than its factorization.

131121109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140872 (or 140865 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 131121109 is about 11450.8125912531. The cubic root of 131121109 is about 508.0317692017.

The spelling of 131121109 in words is "one hundred thirty-one million, one hundred twenty-one thousand, one hundred nine".