121280657 has 8 divisors (see below), whose sum is σ = 122064096. Its totient is φ = 120500352.

The previous prime is 121280647. The next prime is 121280671. The reversal of 121280657 is 756082121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121280657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121280647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179873 + ... + 180545.

It is an arithmetic number, because the mean of its divisors is an integer number (15258012).

Almost surely, 2^121280657 is an apocalyptic number.

It is an amenable number.

121280657 is a deficient number, since it is larger than the sum of its proper divisors (783439).

121280657 is an equidigital number, since it uses as much as digits as its factorization.

121280657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1567.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 121280657 is about 11012.7497474518. The cubic root of 121280657 is about 494.9908606278.

The spelling of 121280657 in words is "one hundred twenty-one million, two hundred eighty thousand, six hundred fifty-seven".