121278125 has 18 divisors (see below), whose sum is σ = 152361342. Its totient is φ = 96530000.

The previous prime is 121278109. The next prime is 121278127. The reversal of 121278125 is 521872121.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 9 ways, for example, as 73239364 + 48038761 = 8558^2 + 6931^2 .

It is not a de Polignac number, because 121278125 - 2⁴ = 121278109 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121278127) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 615527 + ... + 615723.

It is an arithmetic number, because the mean of its divisors is an integer number (8464519).

Almost surely, 2^121278125 is an apocalyptic number.

It is an amenable number.

121278125 is a deficient number, since it is larger than the sum of its proper divisors (31083217).

121278125 is an frugal number, since it uses more digits than its factorization.

121278125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419 (or 202 counting only the distinct ones).

The product of its digits is 2240, while the sum is 29.

The square root of 121278125 is about 11012.6347891865. The cubic root of 121278125 is about 494.9874159301.

The spelling of 121278125 in words is "one hundred twenty-one million, two hundred seventy-eight thousand, one hundred twenty-five".