994721653 has 4 divisors (see below), whose sum is σ = 1021606060. Its totient is φ = 967837248.

The previous prime is 994721647. The next prime is 994721657. The reversal of 994721653 is 356127499.

It is a happy number.

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 967085604 + 27636049 = 31098^2 + 5257^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-994721653 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 (994721657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13442148 + ... + 13442221.

It is an arithmetic number, because the mean of its divisors is an integer number (255401515).

Almost surely, 2^994721653 is an apocalyptic number.

It is an amenable number.

994721653 is a deficient number, since it is larger than the sum of its proper divisors (26884407).

994721653 is a wasteful number, since it uses less digits than its factorization.

994721653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26884406.

The product of its digits is 408240, while the sum is 46.

The square root of 994721653 is about 31539.2081860024. The cubic root of 994721653 is about 998.2374462294.

The spelling of 994721653 in words is "nine hundred ninety-four million, seven hundred twenty-one thousand, six hundred fifty-three".