302135681 has 2 divisors, whose sum is σ = 302135682. Its totient is φ = 302135680.

The previous prime is 302135657. The next prime is 302135699. The reversal of 302135681 is 186531203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215943025 + 86192656 = 14695^2 + 9284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-302135681 is a prime.

It is a super-2 number, since 2×302135681² = 182571939466667522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (302135621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151067840 + 151067841.

It is an arithmetic number, because the mean of its divisors is an integer number (151067841).

Almost surely, 2^302135681 is an apocalyptic number.

It is an amenable number.

302135681 is a deficient number, since it is larger than the sum of its proper divisors (1).

302135681 is an equidigital number, since it uses as much as digits as its factorization.

302135681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 302135681 is about 17382.0505407158. The cubic root of 302135681 is about 671.0177455822.

Adding to 302135681 its reverse (186531203), we get a palindrome (488666884).

The spelling of 302135681 in words is "three hundred two million, one hundred thirty-five thousand, six hundred eighty-one".