1355021 has 2 divisors, whose sum is σ = 1355022. Its totient is φ = 1355020.

The previous prime is 1354987. The next prime is 1355047. The reversal of 1355021 is 1205531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 784996 + 570025 = 886^2 + 755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1355021 - 2⁶ = 1354957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1355071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 677510 + 677511.

It is an arithmetic number, because the mean of its divisors is an integer number (677511).

2^1355021 is an apocalyptic number.

It is an amenable number.

1355021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1355021 is an equidigital number, since it uses as much as digits as its factorization.

1355021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 150, while the sum is 17.

The square root of 1355021 is about 1164.0536929197. The cubic root of 1355021 is about 110.6577941226.

The spelling of 1355021 in words is "one million, three hundred fifty-five thousand, twenty-one".