1961747653 has 2 divisors, whose sum is σ = 1961747654. Its totient is φ = 1961747652.

The previous prime is 1961747651. The next prime is 1961747707. The reversal of 1961747653 is 3567471691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1106360644 + 855387009 = 33262^2 + 29247^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961747653 - 2¹ = 1961747651 is a prime.

Together with 1961747651, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1961747597 and 1961747606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1961747651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 980873826 + 980873827.

It is an arithmetic number, because the mean of its divisors is an integer number (980873827).

Almost surely, 2^1961747653 is an apocalyptic number.

It is an amenable number.

1961747653 is a deficient number, since it is larger than the sum of its proper divisors (1).

1961747653 is an equidigital number, since it uses as much as digits as its factorization.

1961747653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 49.

The square root of 1961747653 is about 44291.6205731965. The cubic root of 1961747653 is about 1251.8367989204.

The spelling of 1961747653 in words is "one billion, nine hundred sixty-one million, seven hundred forty-seven thousand, six hundred fifty-three".