202439681 has 2 divisors, whose sum is σ = 202439682. Its totient is φ = 202439680.

The previous prime is 202439659. The next prime is 202439711. The reversal of 202439681 is 186934202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197149681 + 5290000 = 14041^2 + 2300^2 .

It is a cyclic number.

It is not a de Polignac number, because 202439681 - 2¹⁰ = 202438657 is a prime.

It is a super-2 number, since 2×202439681² = 81963648886763522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (202439581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101219840 + 101219841.

It is an arithmetic number, because the mean of its divisors is an integer number (101219841).

Almost surely, 2^202439681 is an apocalyptic number.

It is an amenable number.

202439681 is a deficient number, since it is larger than the sum of its proper divisors (1).

202439681 is an equidigital number, since it uses as much as digits as its factorization.

202439681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 202439681 is about 14228.1299192831. The cubic root of 202439681 is about 587.1718339897.

The spelling of 202439681 in words is "two hundred two million, four hundred thirty-nine thousand, six hundred eighty-one".