121431265 has 16 divisors (see below), whose sum is σ = 151116480. Its totient is φ = 93562560.

The previous prime is 121431257. The next prime is 121431281. The reversal of 121431265 is 562134121.

It is a happy number.

It is not a de Polignac number, because 121431265 - 2³ = 121431257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78550 + ... + 80080.

It is an arithmetic number, because the mean of its divisors is an integer number (9444780).

Almost surely, 2^121431265 is an apocalyptic number.

It is an amenable number.

121431265 is a deficient number, since it is larger than the sum of its proper divisors (29685215).

121431265 is a wasteful number, since it uses less digits than its factorization.

121431265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2112.

The product of its digits is 1440, while the sum is 25.

The square root of 121431265 is about 11019.5855185211. The cubic root of 121431265 is about 495.1956713749.

Adding to 121431265 its reverse (562134121), we get a palindrome (683565386).

The spelling of 121431265 in words is "one hundred twenty-one million, four hundred thirty-one thousand, two hundred sixty-five".