1021541 has 2 divisors, whose sum is σ = 1021542. Its totient is φ = 1021540.

The previous prime is 1021487. The next prime is 1021561. The reversal of 1021541 is 1451201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 792100 + 229441 = 890^2 + 479^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021541 - 2¹⁰ = 1020517 is a prime.

It is an Ulam number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510770 + 510771.

It is an arithmetic number, because the mean of its divisors is an integer number (510771).

2^1021541 is an apocalyptic number.

It is an amenable number.

1021541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021541 is an equidigital number, since it uses as much as digits as its factorization.

1021541 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1021541 is about 1010.7131145879. The cubic root of 1021541 is about 100.7129384420.

Adding to 1021541 its reverse (1451201), we get a palindrome (2472742).

The spelling of 1021541 in words is "one million, twenty-one thousand, five hundred forty-one".