121540525 has 6 divisors (see below), whose sum is σ = 150710282. Its totient is φ = 97232400.

The previous prime is 121540513. The next prime is 121540541. The reversal of 121540525 is 525045121.

It can be written as a sum of positive squares in 3 ways, for example, as 20196036 + 101344489 = 4494^2 + 10067^2 .

It is not a de Polignac number, because 121540525 - 2²³ = 113151917 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 4861621 = 121540525 / (1 + 2 + 1 + 5 + 4 + 0 + 5 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121540525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2430786 + ... + 2430835.

Almost surely, 2^121540525 is an apocalyptic number.

It is an amenable number.

121540525 is a deficient number, since it is larger than the sum of its proper divisors (29169757).

121540525 is an equidigital number, since it uses as much as digits as its factorization.

121540525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4861631 (or 4861626 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 121540525 is about 11024.5419405978. The cubic root of 121540525 is about 495.3441473044.

Adding to 121540525 its reverse (525045121), we get a palindrome (646585646).

The spelling of 121540525 in words is "one hundred twenty-one million, five hundred forty thousand, five hundred twenty-five".