121406653 has 4 divisors (see below), whose sum is σ = 123396988. Its totient is φ = 119416320.

The previous prime is 121406611. The next prime is 121406671. The reversal of 121406653 is 356604121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34786404 + 86620249 = 5898^2 + 9307^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121406653 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 (121406603) 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, 995076 + ... + 995197.

It is an arithmetic number, because the mean of its divisors is an integer number (30849247).

Almost surely, 2^121406653 is an apocalyptic number.

It is an amenable number.

121406653 is a deficient number, since it is larger than the sum of its proper divisors (1990335).

121406653 is an equidigital number, since it uses as much as digits as its factorization.

121406653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990334.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 121406653 is about 11018.4687230123. The cubic root of 121406653 is about 495.1622132717.

The spelling of 121406653 in words is "one hundred twenty-one million, four hundred six thousand, six hundred fifty-three".