121131536 has 20 divisors (see below), whose sum is σ = 247045200. Its totient is φ = 57377952.

The previous prime is 121131533. The next prime is 121131541. The reversal of 121131536 is 635131121.

It is not an unprimeable number, because it can be changed into a prime (121131533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198926 + ... + 199533.

It is an arithmetic number, because the mean of its divisors is an integer number (12352260).

Almost surely, 2^121131536 is an apocalyptic number.

121131536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

121131536 is an abundant number, since it is smaller than the sum of its proper divisors (125913664).

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

121131536 is a wasteful number, since it uses less digits than its factorization.

121131536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398486 (or 398480 counting only the distinct ones).

The product of its digits is 540, while the sum is 23.

The square root of 121131536 is about 11005.9772850938. The cubic root of 121131536 is about 494.7879049183.

Adding to 121131536 its reverse (635131121), we get a palindrome (756262657).

The spelling of 121131536 in words is "one hundred twenty-one million, one hundred thirty-one thousand, five hundred thirty-six".