1369468781 has 2 divisors, whose sum is σ = 1369468782. Its totient is φ = 1369468780.

The previous prime is 1369468733. The next prime is 1369468817. The reversal of 1369468781 is 1878649631.

Together with next prime (1369468817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1275204100 + 94264681 = 35710^2 + 9709^2 .

It is a cyclic number.

It is not a de Polignac number, because 1369468781 - 2⁶ = 1369468717 is a prime.

It is a super-2 number, since 2×1369468781² = 3750889484267251922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1369468181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684734390 + 684734391.

It is an arithmetic number, because the mean of its divisors is an integer number (684734391).

Almost surely, 2^1369468781 is an apocalyptic number.

It is an amenable number.

1369468781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1369468781 is an equidigital number, since it uses as much as digits as its factorization.

1369468781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 53.

The square root of 1369468781 is about 37006.3343361647. The cubic root of 1369468781 is about 1110.4969722234.

The spelling of 1369468781 in words is "one billion, three hundred sixty-nine million, four hundred sixty-eight thousand, seven hundred eighty-one".