121285729 has 4 divisors (see below), whose sum is σ = 122648580. Its totient is φ = 119922880.

The previous prime is 121285727. The next prime is 121285771. The reversal of 121285729 is 927582121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 927582121 = 1051 ⋅882571.

It can be written as a sum of positive squares in 2 ways, for example, as 74390625 + 46895104 = 8625^2 + 6848^2 .

It is a cyclic number.

It is not a de Polignac number, because 121285729 - 2¹ = 121285727 is a prime.

It is a super-2 number, since 2×121285729² = 29420456118122882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121285727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681292 + ... + 681469.

It is an arithmetic number, because the mean of its divisors is an integer number (30662145).

Almost surely, 2^121285729 is an apocalyptic number.

It is an amenable number.

121285729 is a deficient number, since it is larger than the sum of its proper divisors (1362851).

121285729 is an equidigital number, since it uses as much as digits as its factorization.

121285729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362850.

The product of its digits is 20160, while the sum is 37.

The square root of 121285729 is about 11012.9800235903. The cubic root of 121285729 is about 494.9977607626.

The spelling of 121285729 in words is "one hundred twenty-one million, two hundred eighty-five thousand, seven hundred twenty-nine".