1021961 has 2 divisors, whose sum is σ = 1021962. Its totient is φ = 1021960.

The previous prime is 1021919. The next prime is 1021963. The reversal of 1021961 is 1691201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 846400 + 175561 = 920^2 + 419^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021961 - 2⁶ = 1021897 is a prime.

Together with 1021963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1021963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510980 + 510981.

It is an arithmetic number, because the mean of its divisors is an integer number (510981).

2^1021961 is an apocalyptic number.

It is an amenable number.

1021961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021961 is an equidigital number, since it uses as much as digits as its factorization.

1021961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 1021961 is about 1010.9208673284. The cubic root of 1021961 is about 100.7267390427.

The spelling of 1021961 in words is "one million, twenty-one thousand, nine hundred sixty-one".