1961623 has 2 divisors, whose sum is σ = 1961624. Its totient is φ = 1961622.

The previous prime is 1961593. The next prime is 1961633. The reversal of 1961623 is 3261691.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1961623 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1961591 and 1961600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980811 + 980812.

It is an arithmetic number, because the mean of its divisors is an integer number (980812).

2^1961623 is an apocalyptic number.

1961623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961623 is an equidigital number, since it uses as much as digits as its factorization.

1961623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 28.

The square root of 1961623 is about 1400.5795229119. The cubic root of 1961623 is about 125.1810283699.

The spelling of 1961623 in words is "one million, nine hundred sixty-one thousand, six hundred twenty-three".