121005545 has 16 divisors (see below), whose sum is σ = 150543360. Its totient is φ = 93261504.

The previous prime is 121005539. The next prime is 121005581. The reversal of 121005545 is 545500121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121005545 - 2⁴ = 121005529 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121005545.

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, 124652 + ... + 125618.

It is an arithmetic number, because the mean of its divisors is an integer number (9408960).

Almost surely, 2^121005545 is an apocalyptic number.

It is an amenable number.

121005545 is a deficient number, since it is larger than the sum of its proper divisors (29537815).

121005545 is an equidigital number, since it uses as much as digits as its factorization.

121005545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 121005545 is about 11000.2520425670. The cubic root of 121005545 is about 494.6162995965.

Adding to 121005545 its reverse (545500121), we get a palindrome (666505666).

The spelling of 121005545 in words is "one hundred twenty-one million, five thousand, five hundred forty-five".