121975945 has 32 divisors (see below), whose sum is σ = 183859200. Its totient is φ = 77192640.

The previous prime is 121975927. The next prime is 121975957. The reversal of 121975945 is 549579121.

It is not a de Polignac number, because 121975945 - 2¹¹ = 121973897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19560 + ... + 25030.

It is an arithmetic number, because the mean of its divisors is an integer number (5745600).

Almost surely, 2^121975945 is an apocalyptic number.

It is an amenable number.

121975945 is a deficient number, since it is larger than the sum of its proper divisors (61883255).

121975945 is an equidigital number, since it uses as much as digits as its factorization.

121975945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5510 (or 5496 counting only the distinct ones).

The product of its digits is 113400, while the sum is 43.

The square root of 121975945 is about 11044.2720448203. The cubic root of 121975945 is about 495.9349672476.

The spelling of 121975945 in words is "one hundred twenty-one million, nine hundred seventy-five thousand, nine hundred forty-five".