121541655 has 8 divisors (see below), whose sum is σ = 194466672. Its totient is φ = 64822208.

The previous prime is 121541627. The next prime is 121541657. The reversal of 121541655 is 556145121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121541655 - 2¹⁹ = 121017367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121541657) 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, 4051374 + ... + 4051403.

It is an arithmetic number, because the mean of its divisors is an integer number (24308334).

Almost surely, 2^121541655 is an apocalyptic number.

121541655 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121541655 is a deficient number, since it is larger than the sum of its proper divisors (72925017).

121541655 is an equidigital number, since it uses as much as digits as its factorization.

121541655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8102785.

The product of its digits is 6000, while the sum is 30.

The square root of 121541655 is about 11024.5931897735. The cubic root of 121541655 is about 495.3456824224.

Adding to 121541655 its reverse (556145121), we get a palindrome (677686776).

The spelling of 121541655 in words is "one hundred twenty-one million, five hundred forty-one thousand, six hundred fifty-five".