121188489 has 16 divisors (see below), whose sum is σ = 163616640. Its totient is φ = 79781760.

The previous prime is 121188467. The next prime is 121188499. The reversal of 121188489 is 984881121.

It is not a de Polignac number, because 121188489 - 2⁹ = 121187977 is a prime.

It is a super-2 number, since 2×121188489² = 29373299732206242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121188489.

It is not an unprimeable number, because it can be changed into a prime (121188499) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158869 + ... + 159629.

It is an arithmetic number, because the mean of its divisors is an integer number (10226040).

Almost surely, 2^121188489 is an apocalyptic number.

It is an amenable number.

121188489 is a deficient number, since it is larger than the sum of its proper divisors (42428151).

121188489 is a wasteful number, since it uses less digits than its factorization.

121188489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360.

The product of its digits is 36864, while the sum is 42.

The square root of 121188489 is about 11008.5643478157. The cubic root of 121188489 is about 494.8654383754.

The spelling of 121188489 in words is "one hundred twenty-one million, one hundred eighty-eight thousand, four hundred eighty-nine".