1961653 has 2 divisors, whose sum is σ = 1961654. Its totient is φ = 1961652.

The previous prime is 1961651. The next prime is 1961657. The reversal of 1961653 is 3561691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1830609 + 131044 = 1353^2 + 362^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961653 - 2¹ = 1961651 is a prime.

Together with 1961651, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980826 + 980827.

It is an arithmetic number, because the mean of its divisors is an integer number (980827).

2^1961653 is an apocalyptic number.

It is an amenable number.

1961653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961653 is an equidigital number, since it uses as much as digits as its factorization.

1961653 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4860, while the sum is 31.

The square root of 1961653 is about 1400.5902327233. The cubic root of 1961653 is about 125.1816665170.

It can be divided in two parts, 196 and 1653, that added together give a square (1849 = 43²).

The spelling of 1961653 in words is "one million, nine hundred sixty-one thousand, six hundred fifty-three".