121980655 has 8 divisors (see below), whose sum is σ = 146445984. Its totient is φ = 97538400.

The previous prime is 121980647. The next prime is 121980659. The reversal of 121980655 is 556089121.

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

It is not a de Polignac number, because 121980655 - 2³ = 121980647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121980659) 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, 9585 + ... + 18325.

It is an arithmetic number, because the mean of its divisors is an integer number (18305748).

Almost surely, 2^121980655 is an apocalyptic number.

121980655 is a deficient number, since it is larger than the sum of its proper divisors (24465329).

121980655 is an equidigital number, since it uses as much as digits as its factorization.

121980655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11537.

The product of its (nonzero) digits is 21600, while the sum is 37.

The square root of 121980655 is about 11044.4852754667. The cubic root of 121980655 is about 495.9413505380.

The spelling of 121980655 in words is "one hundred twenty-one million, nine hundred eighty thousand, six hundred fifty-five".