1345621 has 2 divisors, whose sum is σ = 1345622. Its totient is φ = 1345620.

The previous prime is 1345583. The next prime is 1345627. The reversal of 1345621 is 1265431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1311025 + 34596 = 1145^2 + 186^2 .

It is an emirp because it is prime and its reverse (1265431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1345621 - 2¹⁵ = 1312853 is a prime.

It is a pancake number, because a pancake can be divided into 1345621 parts by 1640 straight cuts.

It is a junction number, because it is equal to n+sod(n) for n = 1345592 and 1345601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1345627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 672810 + 672811.

It is an arithmetic number, because the mean of its divisors is an integer number (672811).

2^1345621 is an apocalyptic number.

It is an amenable number.

1345621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1345621 is an equidigital number, since it uses as much as digits as its factorization.

1345621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 1345621 is about 1160.0090516888. The cubic root of 1345621 is about 110.4013164532.

The spelling of 1345621 in words is "one million, three hundred forty-five thousand, six hundred twenty-one".