121128965 has 16 divisors (see below), whose sum is σ = 151139520. Its totient is φ = 93118080.

The previous prime is 121128949. The next prime is 121128989. The reversal of 121128965 is 569821121.

It is not a de Polignac number, because 121128965 - 2⁴ = 121128949 is a prime.

It is a congruent number.

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, 9326 + ... + 18144.

It is an arithmetic number, because the mean of its divisors is an integer number (9446220).

Almost surely, 2^121128965 is an apocalyptic number.

It is an amenable number.

121128965 is a deficient number, since it is larger than the sum of its proper divisors (30010555).

121128965 is an equidigital number, since it uses as much as digits as its factorization.

121128965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8932.

The product of its digits is 8640, while the sum is 35.

The square root of 121128965 is about 11005.8604843056. The cubic root of 121128965 is about 494.7844042921.

The spelling of 121128965 in words is "one hundred twenty-one million, one hundred twenty-eight thousand, nine hundred sixty-five".