121151540 has 24 divisors (see below), whose sum is σ = 254911272. Its totient is φ = 48366720.

The previous prime is 121151539. The next prime is 121151561. The reversal of 121151540 is 45151121.

It can be written as a sum of positive squares in 4 ways, for example, as 1948816 + 119202724 = 1396^2 + 10918^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5222 + ... + 16418.

It is an arithmetic number, because the mean of its divisors is an integer number (10621303).

Almost surely, 2^121151540 is an apocalyptic number.

121151540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121151540 is an abundant number, since it is smaller than the sum of its proper divisors (133759732).

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

121151540 is a wasteful number, since it uses less digits than its factorization.

121151540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11747 (or 11745 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 121151540 is about 11006.8860264836. The cubic root of 121151540 is about 494.8151403044.

The spelling of 121151540 in words is "one hundred twenty-one million, one hundred fifty-one thousand, five hundred forty".