1021457 has 2 divisors, whose sum is σ = 1021458. Its totient is φ = 1021456.

The previous prime is 1021441. The next prime is 1021463. The reversal of 1021457 is 7541201.

1021457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 891136 + 130321 = 944^2 + 361^2 .

It is an emirp because it is prime and its reverse (7541201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021457 - 2⁴ = 1021441 is a prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (1021417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510728 + 510729.

It is an arithmetic number, because the mean of its divisors is an integer number (510729).

2^1021457 is an apocalyptic number.

It is an amenable number.

1021457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021457 is an equidigital number, since it uses as much as digits as its factorization.

1021457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 1021457 is about 1010.6715589152. The cubic root of 1021457 is about 100.7101778680.

Adding to 1021457 its reverse (7541201), we get a palindrome (8562658).

The spelling of 1021457 in words is "one million, twenty-one thousand, four hundred fifty-seven".