1936561657 has 2 divisors, whose sum is σ = 1936561658. Its totient is φ = 1936561656.

The previous prime is 1936561639. The next prime is 1936561663. The reversal of 1936561657 is 7561656391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1576169401 + 360392256 = 39701^2 + 18984^2 .

It is a cyclic number.

It is not a de Polignac number, because 1936561657 - 2¹¹ = 1936559609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1936561657.

It is not a weakly prime, because it can be changed into another prime (1936561357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 968280828 + 968280829.

It is an arithmetic number, because the mean of its divisors is an integer number (968280829).

Almost surely, 2^1936561657 is an apocalyptic number.

It is an amenable number.

1936561657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1936561657 is an equidigital number, since it uses as much as digits as its factorization.

1936561657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1020600, while the sum is 49.

The square root of 1936561657 is about 44006.3820030686. The cubic root of 1936561657 is about 1246.4564509270.

The spelling of 1936561657 in words is "one billion, nine hundred thirty-six million, five hundred sixty-one thousand, six hundred fifty-seven".