1961021 has 2 divisors, whose sum is σ = 1961022. Its totient is φ = 1961020.

The previous prime is 1960993. The next prime is 1961027. The reversal of 1961021 is 1201691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1792921 + 168100 = 1339^2 + 410^2 .

It is an emirp because it is prime and its reverse (1201691) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1961021 - 2¹⁸ = 1698877 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1960984 and 1961002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980510 + 980511.

It is an arithmetic number, because the mean of its divisors is an integer number (980511).

2^1961021 is an apocalyptic number.

It is an amenable number.

1961021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961021 is an equidigital number, since it uses as much as digits as its factorization.

1961021 is an evil number, because the sum of its binary digits is even.

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

The square root of 1961021 is about 1400.3645953822. The cubic root of 1961021 is about 125.1682215106.

The spelling of 1961021 in words is "one million, nine hundred sixty-one thousand, twenty-one".