1345921 has 2 divisors, whose sum is σ = 1345922. Its totient is φ = 1345920.

The previous prime is 1345913. The next prime is 1345931. The reversal of 1345921 is 1295431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1185921 + 160000 = 1089^2 + 400^2 .

It is a cyclic number.

It is not a de Polignac number, because 1345921 - 2³ = 1345913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1345931) 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 as a sum of consecutive naturals, namely, 672960 + 672961.

It is an arithmetic number, because the mean of its divisors is an integer number (672961).

2^1345921 is an apocalyptic number.

It is an amenable number.

1345921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345921 is an equidigital number, since it uses as much as digits as its factorization.

1345921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 25.

The square root of 1345921 is about 1160.1383538182. The cubic root of 1345921 is about 110.4095203318.

The spelling of 1345921 in words is "one million, three hundred forty-five thousand, nine hundred twenty-one".