1345681 has 4 divisors (see below), whose sum is σ = 1359652. Its totient is φ = 1331712.

The previous prime is 1345667. The next prime is 1345691. The reversal of 1345681 is 1865431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 614656 + 731025 = 784^2 + 855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345681 - 2⁵ = 1345649 is a prime.

It is a super-2 number, since 2×1345681² = 3621714707522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1345621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6840 + ... + 7033.

It is an arithmetic number, because the mean of its divisors is an integer number (339913).

2^1345681 is an apocalyptic number.

It is an amenable number.

1345681 is a deficient number, since it is larger than the sum of its proper divisors (13971).

1345681 is an equidigital number, since it uses as much as digits as its factorization.

1345681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13970.

The product of its digits is 2880, while the sum is 28.

The square root of 1345681 is about 1160.0349132677. The cubic root of 1345681 is about 110.4029573264.

It can be divided in two parts, 13456 and 81, that multiplied together give a square (1089936 = 1044²).

The spelling of 1345681 in words is "one million, three hundred forty-five thousand, six hundred eighty-one".