121564 has 6 divisors (see below), whose sum is σ = 212744. Its totient is φ = 60780.

The previous prime is 121559. The next prime is 121571. The reversal of 121564 is 465121.

It is a plaindrome in base 6.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15192 + ... + 15199.

2¹²¹⁵⁶⁴ is an apocalyptic number.

It is an amenable number.

121564 is a deficient number, since it is larger than the sum of its proper divisors (91180).

121564 is a wasteful number, since it uses less digits than its factorization.

121564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30395 (or 30393 counting only the distinct ones).

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

The square root of 121564 is about 348.6602931221. The cubic root of 121564 is about 49.5376036408.

Adding to 121564 its reverse (465121), we get a palindrome (586685).

The spelling of 121564 in words is "one hundred twenty-one thousand, five hundred sixty-four".