121777825 has 12 divisors (see below), whose sum is σ = 162620668. Its totient is φ = 89928000.

The previous prime is 121777823. The next prime is 121777837. The reversal of 121777825 is 528777121.

It can be written as a sum of positive squares in 6 ways, for example, as 94864 + 121682961 = 308^2 + 11031^2 .

It is not a de Polignac number, because 121777825 - 2¹ = 121777823 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121777823) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187026 + ... + 187675.

Almost surely, 2^121777825 is an apocalyptic number.

It is an amenable number.

121777825 is a deficient number, since it is larger than the sum of its proper divisors (40842843).

121777825 is a wasteful number, since it uses less digits than its factorization.

121777825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374724 (or 374719 counting only the distinct ones).

The product of its digits is 54880, while the sum is 40.

The square root of 121777825 is about 11035.2990444301. The cubic root of 121777825 is about 495.6663135098. Note that the first 3 decimals are identical.

It can be divided in two parts, 12177 and 7825, that added together give a palindrome (20002).

The spelling of 121777825 in words is "one hundred twenty-one million, seven hundred seventy-seven thousand, eight hundred twenty-five".