121540881 has 32 divisors (see below), whose sum is σ = 205083648. Its totient is φ = 62187840.

The previous prime is 121540877. The next prime is 121540897. The reversal of 121540881 is 188045121.

It is a happy number.

It is not a de Polignac number, because 121540881 - 2² = 121540877 is a prime.

It is a super-2 number, since 2×121540881² = 29544371508512322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121540481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11551 + ... + 19403.

It is an arithmetic number, because the mean of its divisors is an integer number (6408864).

Almost surely, 2^121540881 is an apocalyptic number.

121540881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121540881 is a deficient number, since it is larger than the sum of its proper divisors (83542767).

121540881 is a wasteful number, since it uses less digits than its factorization.

121540881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7941.

The product of its (nonzero) digits is 2560, while the sum is 30.

The square root of 121540881 is about 11024.5580863815. The cubic root of 121540881 is about 495.3446309355.

The spelling of 121540881 in words is "one hundred twenty-one million, five hundred forty thousand, eight hundred eighty-one".