1021261 has 2 divisors, whose sum is σ = 1021262. Its totient is φ = 1021260.

The previous prime is 1021259. The next prime is 1021271. The reversal of 1021261 is 1621201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1010025 + 11236 = 1005^2 + 106^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021261 - 2¹ = 1021259 is a prime.

Together with 1021259, it forms a pair of twin primes.

1021261 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510630 + 510631.

It is an arithmetic number, because the mean of its divisors is an integer number (510631).

2^1021261 is an apocalyptic number.

It is an amenable number.

1021261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021261 is an equidigital number, since it uses as much as digits as its factorization.

1021261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1021261 is about 1010.5745890334. The cubic root of 1021261 is about 100.7037359399.

Adding to 1021261 its reverse (1621201), we get a palindrome (2642462).

The spelling of 1021261 in words is "one million, twenty-one thousand, two hundred sixty-one".