121281655 has 32 divisors (see below), whose sum is σ = 176981760. Its totient is φ = 78635520.

The previous prime is 121281637. The next prime is 121281659. The reversal of 121281655 is 556182121.

It is not a de Polignac number, because 121281655 - 2⁵ = 121281623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121281659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14352 + ... + 21178.

It is an arithmetic number, because the mean of its divisors is an integer number (5530680).

Almost surely, 2^121281655 is an apocalyptic number.

121281655 is a deficient number, since it is larger than the sum of its proper divisors (55700105).

121281655 is a wasteful number, since it uses less digits than its factorization.

121281655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6879.

The product of its digits is 4800, while the sum is 31.

The square root of 121281655 is about 11012.7950584763. The cubic root of 121281655 is about 494.9922183588.

The spelling of 121281655 in words is "one hundred twenty-one million, two hundred eighty-one thousand, six hundred fifty-five".