120818657 has 4 divisors (see below), whose sum is σ = 122176260. Its totient is φ = 119461056.

The previous prime is 120818629. The next prime is 120818683. The reversal of 120818657 is 756818021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 756818021 = 1801 ⋅420221.

It can be written as a sum of positive squares in 2 ways, for example, as 38390416 + 82428241 = 6196^2 + 9079^2 .

It is a cyclic number.

It is not a de Polignac number, because 120818657 - 2¹⁶ = 120753121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 120818657.

It is not an unprimeable number, because it can be changed into a prime (120818557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678668 + ... + 678845.

It is an arithmetic number, because the mean of its divisors is an integer number (30544065).

Almost surely, 2^120818657 is an apocalyptic number.

It is an amenable number.

120818657 is a deficient number, since it is larger than the sum of its proper divisors (1357603).

120818657 is an equidigital number, since it uses as much as digits as its factorization.

120818657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357602.

The product of its (nonzero) digits is 26880, while the sum is 38.

The square root of 120818657 is about 10991.7540456471. The cubic root of 120818657 is about 494.3615303332.

The spelling of 120818657 in words is "one hundred twenty million, eight hundred eighteen thousand, six hundred fifty-seven".