121136641 has 4 divisors (see below), whose sum is σ = 123422292. Its totient is φ = 118850992.

The previous prime is 121136621. The next prime is 121136651. The reversal of 121136641 is 146631121.

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 44836416 + 76300225 = 6696^2 + 8735^2 .

It is a cyclic number.

It is not a de Polignac number, because 121136641 - 2⁹ = 121136129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121136621) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 1142746 + ... + 1142851.

It is an arithmetic number, because the mean of its divisors is an integer number (30855573).

Almost surely, 2^121136641 is an apocalyptic number.

It is an amenable number.

121136641 is a deficient number, since it is larger than the sum of its proper divisors (2285651).

121136641 is an equidigital number, since it uses as much as digits as its factorization.

121136641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2285650.

The product of its digits is 864, while the sum is 25.

The square root of 121136641 is about 11006.2092020823. The cubic root of 121136641 is about 494.7948556455.

Adding to 121136641 its reverse (146631121), we get a palindrome (267767762).

It can be divided in two parts, 121 and 136641, that multiplied together give a palindrome (16533561).

The spelling of 121136641 in words is "one hundred twenty-one million, one hundred thirty-six thousand, six hundred forty-one".