202997681 has 4 divisors (see below), whose sum is σ = 204171252. Its totient is φ = 201824112.

The previous prime is 202997677. The next prime is 202997687. The reversal of 202997681 is 186799202.

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 148474225 + 54523456 = 12185^2 + 7384^2 .

It is a cyclic number.

It is not a de Polignac number, because 202997681 - 2² = 202997677 is a prime.

It is a super-2 number, since 2×202997681² = 82416116982755522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202997687) 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, 586526 + ... + 586871.

It is an arithmetic number, because the mean of its divisors is an integer number (51042813).

Almost surely, 2^202997681 is an apocalyptic number.

It is an amenable number.

202997681 is a deficient number, since it is larger than the sum of its proper divisors (1173571).

202997681 is a wasteful number, since it uses less digits than its factorization.

202997681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1173570.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 202997681 is about 14247.7254675966. The cubic root of 202997681 is about 587.7108279707.

The spelling of 202997681 in words is "two hundred two million, nine hundred ninety-seven thousand, six hundred eighty-one".