121281657 has 16 divisors (see below), whose sum is σ = 186449280. Its totient is φ = 68689152.

The previous prime is 121281637. The next prime is 121281659. The reversal of 121281657 is 756182121.

It is a de Polignac number, because none of the positive numbers 2^k-121281657 is a prime.

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

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23182 + ... + 27927.

It is an arithmetic number, because the mean of its divisors is an integer number (11653080).

Almost surely, 2^121281657 is an apocalyptic number.

It is an amenable number.

121281657 is a deficient number, since it is larger than the sum of its proper divisors (65167623).

121281657 is a wasteful number, since it uses less digits than its factorization.

121281657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51232.

The product of its digits is 6720, while the sum is 33.

The square root of 121281657 is about 11012.7951492798. The cubic root of 121281657 is about 494.9922210797.

The spelling of 121281657 in words is "one hundred twenty-one million, two hundred eighty-one thousand, six hundred fifty-seven".