121547540 has 24 divisors (see below), whose sum is σ = 256580520. Its totient is φ = 48365568.

The previous prime is 121547521. The next prime is 121547549. The reversal of 121547540 is 45745121.

121547540 = T₁₂₉ + T₁₃₀ + ... + T₉₀₀.

It can be written as a sum of positive squares in 4 ways, for example, as 6543364 + 115004176 = 2558^2 + 10724^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121547549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11885 + ... + 19604.

It is an arithmetic number, because the mean of its divisors is an integer number (10690855).

Almost surely, 2^121547540 is an apocalyptic number.

121547540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121547540 is an abundant number, since it is smaller than the sum of its proper divisors (135032980).

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

121547540 is a wasteful number, since it uses less digits than its factorization.

121547540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31691 (or 31689 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 121547540 is about 11024.8600898152. The cubic root of 121547540 is about 495.3536771089.

The spelling of 121547540 in words is "one hundred twenty-one million, five hundred forty-seven thousand, five hundred forty".