299261981 has 2 divisors, whose sum is σ = 299261982. Its totient is φ = 299261980.

The previous prime is 299261953. The next prime is 299262001. The reversal of 299261981 is 189162992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 267845956 + 31416025 = 16366^2 + 5605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-299261981 is a prime.

It is a super-2 number, since 2×299261981² = 179115466544088722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (299261581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 149630990 + 149630991.

It is an arithmetic number, because the mean of its divisors is an integer number (149630991).

Almost surely, 2^299261981 is an apocalyptic number.

It is an amenable number.

299261981 is a deficient number, since it is larger than the sum of its proper divisors (1).

299261981 is an equidigital number, since it uses as much as digits as its factorization.

299261981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 47.

The square root of 299261981 is about 17299.1901833583. The cubic root of 299261981 is about 668.8835501645.

The spelling of 299261981 in words is "two hundred ninety-nine million, two hundred sixty-one thousand, nine hundred eighty-one".