121491744 has 72 divisors (see below), whose sum is σ = 350577360. Its totient is φ = 36812160.

The previous prime is 121491691. The next prime is 121491779. The reversal of 121491744 is 447194121.

It is a Harshad number since it is a multiple of its sum of digits (33).

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 11 ways as a sum of consecutive naturals, for example, 6387 + ... + 16845.

It is an arithmetic number, because the mean of its divisors is an integer number (4869130).

Almost surely, 2^121491744 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121491744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175288680).

121491744 is an abundant number, since it is smaller than the sum of its proper divisors (229085616).

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

121491744 is a wasteful number, since it uses less digits than its factorization.

121491744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10494 (or 10475 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 121491744 is about 11022.3293363971. The cubic root of 121491744 is about 495.2778686803.

The spelling of 121491744 in words is "one hundred twenty-one million, four hundred ninety-one thousand, seven hundred forty-four".