131121099 has 24 divisors (see below), whose sum is σ = 200137392. Its totient is φ = 85756320.

The previous prime is 131121031. The next prime is 131121113. The reversal of 131121099 is 990121131.

It is not a de Polignac number, because 131121099 - 2¹⁹ = 130596811 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (131921099) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7789 + ... + 17969.

It is an arithmetic number, because the mean of its divisors is an integer number (8339058).

Almost surely, 2^131121099 is an apocalyptic number.

131121099 is a deficient number, since it is larger than the sum of its proper divisors (69016293).

131121099 is an equidigital number, since it uses as much as digits as its factorization.

131121099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10249 (or 10237 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 27.

The square root of 131121099 is about 11450.8121546028. The cubic root of 131121099 is about 508.0317562866.

The spelling of 131121099 in words is "one hundred thirty-one million, one hundred twenty-one thousand, ninety-nine".