121631872 has 32 divisors (see below), whose sum is σ = 256571820. Its totient is φ = 57237504.

The previous prime is 121631857. The next prime is 121631927. The reversal of 121631872 is 278136121.

It can be written as a sum of positive squares in 2 ways, for example, as 117852736 + 3779136 = 10856^2 + 1944^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25773 + ... + 30124.

Almost surely, 2^121631872 is an apocalyptic number.

It is an amenable number.

121631872 is an abundant number, since it is smaller than the sum of its proper divisors (134939948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121631872 is an equidigital number, since it uses as much as digits as its factorization.

121631872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55928 (or 55916 counting only the distinct ones).

The product of its digits is 4032, while the sum is 31.

The square root of 121631872 is about 11028.6840556795. The cubic root of 121631872 is about 495.4682125650.

Adding to 121631872 its reverse (278136121), we get a palindrome (399767993).

The spelling of 121631872 in words is "one hundred twenty-one million, six hundred thirty-one thousand, eight hundred seventy-two".