302999981 has 2 divisors, whose sum is σ = 302999982. Its totient is φ = 302999980.

The previous prime is 302999969. The next prime is 302999989. The reversal of 302999981 is 189999203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192959881 + 110040100 = 13891^2 + 10490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-302999981 is a prime.

It is a super-2 number, since 2×302999981² = 183617976972000722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (302999989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151499990 + 151499991.

It is an arithmetic number, because the mean of its divisors is an integer number (151499991).

Almost surely, 2^302999981 is an apocalyptic number.

It is an amenable number.

302999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

302999981 is an equidigital number, since it uses as much as digits as its factorization.

302999981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 302999981 is about 17406.8946397685. The cubic root of 302999981 is about 671.6569821157.

The spelling of 302999981 in words is "three hundred two million, nine hundred ninety-nine thousand, nine hundred eighty-one".