269311981 has 2 divisors, whose sum is σ = 269311982. Its totient is φ = 269311980.

The previous prime is 269311979. The next prime is 269312003. The reversal of 269311981 is 189113962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141395881 + 127916100 = 11891^2 + 11310^2 .

It is a cyclic number.

It is not a de Polignac number, because 269311981 - 2¹ = 269311979 is a prime.

It is a super-2 number, since 2×269311981² = 145057886220288722, which contains 22 as substring.

Together with 269311979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (269311901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134655990 + 134655991.

It is an arithmetic number, because the mean of its divisors is an integer number (134655991).

Almost surely, 2^269311981 is an apocalyptic number.

It is an amenable number.

269311981 is a deficient number, since it is larger than the sum of its proper divisors (1).

269311981 is an equidigital number, since it uses as much as digits as its factorization.

269311981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 40.

The square root of 269311981 is about 16410.7276194567. The cubic root of 269311981 is about 645.7809429894.

The spelling of 269311981 in words is "two hundred sixty-nine million, three hundred eleven thousand, nine hundred eighty-one".