1961633 has 2 divisors, whose sum is σ = 1961634. Its totient is φ = 1961632.

The previous prime is 1961623. The next prime is 1961651. The reversal of 1961633 is 3361691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1760929 + 200704 = 1327^2 + 448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1961596 and 1961605.

It is not a weakly prime, because it can be changed into another prime (1961623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980816 + 980817.

It is an arithmetic number, because the mean of its divisors is an integer number (980817).

2^1961633 is an apocalyptic number.

It is an amenable number.

1961633 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961633 is an equidigital number, since it uses as much as digits as its factorization.

1961633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 29.

The square root of 1961633 is about 1400.5830928581. The cubic root of 1961633 is about 125.1812410863.

The spelling of 1961633 in words is "one million, nine hundred sixty-one thousand, six hundred thirty-three".