121306637 has 4 divisors (see below), whose sum is σ = 121356636. Its totient is φ = 121256640.

The previous prime is 121306631. The next prime is 121306639. The reversal of 121306637 is 736603121.

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 49294441 + 72012196 = 7021^2 + 8486^2 .

It is a cyclic number.

It is not a de Polignac number, because 121306637 - 2⁶ = 121306573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121306631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21164 + ... + 26277.

It is an arithmetic number, because the mean of its divisors is an integer number (30339159).

Almost surely, 2^121306637 is an apocalyptic number.

It is an amenable number.

121306637 is a deficient number, since it is larger than the sum of its proper divisors (49999).

121306637 is an equidigital number, since it uses as much as digits as its factorization.

121306637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49998.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 121306637 is about 11013.9292262117. The cubic root of 121306637 is about 495.0262027418.

Adding to 121306637 its reverse (736603121), we get a palindrome (857909758).

The spelling of 121306637 in words is "one hundred twenty-one million, three hundred six thousand, six hundred thirty-seven".