121535437 has 4 divisors (see below), whose sum is σ = 123200380. Its totient is φ = 119870496.

The previous prime is 121535389. The next prime is 121535443. The reversal of 121535437 is 734535121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52794756 + 68740681 = 7266^2 + 8291^2 .

It is a cyclic number.

It is not a de Polignac number, because 121535437 - 2¹⁵ = 121502669 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121535399 and 121535408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121535497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832362 + ... + 832507.

It is an arithmetic number, because the mean of its divisors is an integer number (30800095).

Almost surely, 2^121535437 is an apocalyptic number.

It is an amenable number.

121535437 is a deficient number, since it is larger than the sum of its proper divisors (1664943).

121535437 is an equidigital number, since it uses as much as digits as its factorization.

121535437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664942.

The product of its digits is 12600, while the sum is 31.

The square root of 121535437 is about 11024.3111802960. The cubic root of 121535437 is about 495.3372350798.

The spelling of 121535437 in words is "one hundred twenty-one million, five hundred thirty-five thousand, four hundred thirty-seven".