1020401 has 2 divisors, whose sum is σ = 1020402. Its totient is φ = 1020400.

The previous prime is 1020389. The next prime is 1020407. The reversal of 1020401 is 1040201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 970225 + 50176 = 985^2 + 224^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020401 - 2⁶ = 1020337 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1020407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510200 + 510201.

It is an arithmetic number, because the mean of its divisors is an integer number (510201).

2^1020401 is an apocalyptic number.

It is an amenable number.

1020401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020401 is an equidigital number, since it uses as much as digits as its factorization.

1020401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1020401 is about 1010.1489989106. The cubic root of 1020401 is about 100.6754605907.

Adding to 1020401 its reverse (1040201), we get a palindrome (2060602).

The spelling of 1020401 in words is "one million, twenty thousand, four hundred one".