121391000 has 64 divisors (see below), whose sum is σ = 299052000. Its totient is φ = 45993600.

The previous prime is 121390993. The next prime is 121391051. The reversal of 121391000 is 193121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 121391000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15806 + ... + 22194.

Almost surely, 2^121391000 is an apocalyptic number.

121391000 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 121391000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149526000).

121391000 is an abundant number, since it is smaller than the sum of its proper divisors (177661000).

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

121391000 is a wasteful number, since it uses less digits than its factorization.

121391000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6429 (or 6415 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 121391000 is about 11017.7583927040. The cubic root of 121391000 is about 495.1409318810.

The spelling of 121391000 in words is "one hundred twenty-one million, three hundred ninety-one thousand".