961021 has 2 divisors, whose sum is σ = 961022. Its totient is φ = 961020.

The previous prime is 961003. The next prime is 961033. The reversal of 961021 is 120169.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 792100 + 168921 = 890^2 + 411^2 .

It is a cyclic number.

It is not a de Polignac number, because 961021 - 2⁵ = 960989 is a prime.

It is a super-2 number, since 2×961021² = 1847122724882, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 961021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (961091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480510 + 480511.

It is an arithmetic number, because the mean of its divisors is an integer number (480511).

2⁹⁶¹⁰²¹ is an apocalyptic number.

It is an amenable number.

961021 is a deficient number, since it is larger than the sum of its proper divisors (1).

961021 is an equidigital number, since it uses as much as digits as its factorization.

961021 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 19.

The square root of 961021 is about 980.3167855341. The cubic root of 961021 is about 98.6834428397.

The spelling of 961021 in words is "nine hundred sixty-one thousand, twenty-one".