121000645 has 16 divisors (see below), whose sum is σ = 161835840. Its totient is φ = 86310144.

The previous prime is 121000603. The next prime is 121000651. The reversal of 121000645 is 546000121.

It is a cyclic number.

It is not a de Polignac number, because 121000645 - 2⁹ = 121000133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

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, 35847 + ... + 39076.

It is an arithmetic number, because the mean of its divisors is an integer number (10114740).

Almost surely, 2^121000645 is an apocalyptic number.

It is an amenable number.

121000645 is a deficient number, since it is larger than the sum of its proper divisors (40835195).

121000645 is a wasteful number, since it uses less digits than its factorization.

121000645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74964.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 121000645 is about 11000.0293181427. The cubic root of 121000645 is about 494.6096231736.

Adding to 121000645 its reverse (546000121), we get a palindrome (667000766).

The spelling of 121000645 in words is "one hundred twenty-one million, six hundred forty-five", and thus it is an aban number.