1268602381 has 2 divisors, whose sum is σ = 1268602382. Its totient is φ = 1268602380.

The previous prime is 1268602343. The next prime is 1268602403. The reversal of 1268602381 is 1832068621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1086757156 + 181845225 = 32966^2 + 13485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1268602381 is a prime.

It is a super-2 number, since 2×1268602381² = 3218704002157738322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1268602381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1268602301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 634301190 + 634301191.

It is an arithmetic number, because the mean of its divisors is an integer number (634301191).

Almost surely, 2^1268602381 is an apocalyptic number.

It is an amenable number.

1268602381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1268602381 is an equidigital number, since it uses as much as digits as its factorization.

1268602381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 1268602381 is about 35617.4448971287. Note that the first 3 decimals coincide. The cubic root of 1268602381 is about 1082.5347359633.

The spelling of 1268602381 in words is "one billion, two hundred sixty-eight million, six hundred two thousand, three hundred eighty-one".