121782825 has 24 divisors (see below), whose sum is σ = 223720800. Its totient is φ = 64950480.

The previous prime is 121782823. The next prime is 121782847. The reversal of 121782825 is 528287121.

It is not a de Polignac number, because 121782825 - 2¹ = 121782823 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121782825.

It is not an unprimeable number, because it can be changed into a prime (121782823) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89535 + ... + 90884.

It is an arithmetic number, because the mean of its divisors is an integer number (9321700).

Almost surely, 2^121782825 is an apocalyptic number.

121782825 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121782825 is a deficient number, since it is larger than the sum of its proper divisors (101937975).

121782825 is a wasteful number, since it uses less digits than its factorization.

121782825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180438 (or 180427 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 121782825 is about 11035.5255878458. The cubic root of 121782825 is about 495.6730971687.

The spelling of 121782825 in words is "one hundred twenty-one million, seven hundred eighty-two thousand, eight hundred twenty-five".