121575 has 12 divisors (see below), whose sum is σ = 201128. Its totient is φ = 64800.

The previous prime is 121571. The next prime is 121577. The reversal of 121575 is 575121.

It is not a de Polignac number, because 121575 - 2² = 121571 is a prime.

It is an Ulam number.

It is a Duffinian number.

121575 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 736 + ... + 885.

2¹²¹⁵⁷⁵ is an apocalyptic number.

121575 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121575 is a deficient number, since it is larger than the sum of its proper divisors (79553).

121575 is a wasteful number, since it uses less digits than its factorization.

121575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1634 (or 1629 counting only the distinct ones).

The product of its digits is 350, while the sum is 21.

The square root of 121575 is about 348.6760674322. The cubic root of 121575 is about 49.5390977707.

Adding to 121575 its reverse (575121), we get a palindrome (696696).

It can be divided in two parts, 1215 and 75, that multiplied together give a cube (91125 = 45³).

The spelling of 121575 in words is "one hundred twenty-one thousand, five hundred seventy-five".