1369981 has 2 divisors, whose sum is σ = 1369982. Its totient is φ = 1369980.

The previous prime is 1369969. The next prime is 1370027. The reversal of 1369981 is 1899631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 783225 + 586756 = 885^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 1369981 - 2⁷ = 1369853 is a prime.

It is a super-2 number, since 2×1369981² = 3753695880722, 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 1369981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1369961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684990 + 684991.

It is an arithmetic number, because the mean of its divisors is an integer number (684991).

2^1369981 is an apocalyptic number.

It is an amenable number.

1369981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1369981 is an equidigital number, since it uses as much as digits as its factorization.

1369981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664, while the sum is 37.

The square root of 1369981 is about 1170.4618746461. The cubic root of 1369981 is about 111.0635407105.

The spelling of 1369981 in words is "one million, three hundred sixty-nine thousand, nine hundred eighty-one".