121559772 has 24 divisors (see below), whose sum is σ = 283829392. Its totient is φ = 40492800.

The previous prime is 121559771. The next prime is 121559791. The reversal of 121559772 is 277955121.

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 121559772.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121559771) 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, 24372 + ... + 28932.

Almost surely, 2^121559772 is an apocalyptic number.

121559772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

121559772 is an abundant number, since it is smaller than the sum of its proper divisors (162269620).

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

121559772 is a wasteful number, since it uses less digits than its factorization.

121559772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6789 (or 6787 counting only the distinct ones).

The product of its digits is 44100, while the sum is 39.

The square root of 121559772 is about 11025.4148221280. The cubic root of 121559772 is about 495.3702932766.

The spelling of 121559772 in words is "one hundred twenty-one million, five hundred fifty-nine thousand, seven hundred seventy-two".