121505164 has 12 divisors (see below), whose sum is σ = 231964488. Its totient is φ = 55229600.

The previous prime is 121505161. The next prime is 121505191. The reversal of 121505164 is 461505121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121505161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1380697 + ... + 1380784.

It is an arithmetic number, because the mean of its divisors is an integer number (19330374).

Almost surely, 2^121505164 is an apocalyptic number.

It is an amenable number.

121505164 is a deficient number, since it is larger than the sum of its proper divisors (110459324).

121505164 is a wasteful number, since it uses less digits than its factorization.

121505164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2761496 (or 2761494 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 121505164 is about 11022.9380838323. The cubic root of 121505164 is about 495.2961041699.

The spelling of 121505164 in words is "one hundred twenty-one million, five hundred five thousand, one hundred sixty-four".