121749144 has 32 divisors (see below), whose sum is σ = 332043840. Its totient is φ = 36893600.

The previous prime is 121749119. The next prime is 121749149. The reversal of 121749144 is 441947121.

It is a super-3 number, since 3×121749144³ (a number of 25 digits) contains 333 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121749149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 230322 + ... + 230849.

It is an arithmetic number, because the mean of its divisors is an integer number (10376370).

Almost surely, 2^121749144 is an apocalyptic number.

It is an amenable number.

121749144 is an abundant number, since it is smaller than the sum of its proper divisors (210294696).

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

121749144 is a wasteful number, since it uses less digits than its factorization.

121749144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 461191 (or 461187 counting only the distinct ones).

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

The square root of 121749144 is about 11033.9994562262. Note that the first 3 decimals coincide. The cubic root of 121749144 is about 495.6273974982.

The spelling of 121749144 in words is "one hundred twenty-one million, seven hundred forty-nine thousand, one hundred forty-four".