121591044 has 30 divisors (see below), whose sum is σ = 317863854. Its totient is φ = 40530240.

The previous prime is 121591037. The next prime is 121591049. The reversal of 121591044 is 440195121.

It can be written as a sum of positive squares in only one way, i.e., 110502144 + 11088900 = 10512^2 + 3330^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 121590999 and 121591017.

It is not an unprimeable number, because it can be changed into a prime (121591049) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 187317 + ... + 187964.

Almost surely, 2^121591044 is an apocalyptic number.

It is an amenable number.

121591044 is an abundant number, since it is smaller than the sum of its proper divisors (196272810).

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

121591044 is a wasteful number, since it uses less digits than its factorization.

121591044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375297 (or 375286 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 121591044 is about 11026.8329088637. The cubic root of 121591044 is about 495.4127686541.

It can be divided in two parts, 12159 and 1044, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 121591044 in words is "one hundred twenty-one million, five hundred ninety-one thousand, forty-four".