121631855 has 16 divisors (see below), whose sum is σ = 154936800. Its totient is φ = 91348992.

The previous prime is 121631849. The next prime is 121631857. The reversal of 121631855 is 558136121.

It is a cyclic number.

It is not a de Polignac number, because 121631855 - 2¹⁸ = 121369711 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121631857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36572 + ... + 39758.

It is an arithmetic number, because the mean of its divisors is an integer number (9683550).

Almost surely, 2^121631855 is an apocalyptic number.

121631855 is a deficient number, since it is larger than the sum of its proper divisors (33304945).

121631855 is a wasteful number, since it uses less digits than its factorization.

121631855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3658.

The product of its digits is 7200, while the sum is 32.

The square root of 121631855 is about 11028.6832849620. The cubic root of 121631855 is about 495.4681894818.

Adding to 121631855 its reverse (558136121), we get a palindrome (679767976).

The spelling of 121631855 in words is "one hundred twenty-one million, six hundred thirty-one thousand, eight hundred fifty-five".