121125978 has 24 divisors (see below), whose sum is σ = 262773108. Its totient is φ = 40324032.

The previous prime is 121125941. The next prime is 121126001. The reversal of 121125978 is 879521121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 113358609 + 7767369 = 10647^2 + 2787^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11950 + ... + 19622.

Almost surely, 2^121125978 is an apocalyptic number.

121125978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

121125978 is an abundant number, since it is smaller than the sum of its proper divisors (141647130).

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

121125978 is a wasteful number, since it uses less digits than its factorization.

121125978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8558 (or 8555 counting only the distinct ones).

The product of its digits is 10080, while the sum is 36.

The square root of 121125978 is about 11005.7247830391. The cubic root of 121125978 is about 494.7803371857.

The spelling of 121125978 in words is "one hundred twenty-one million, one hundred twenty-five thousand, nine hundred seventy-eight".