1641563597 has 2 divisors, whose sum is σ = 1641563598. Its totient is φ = 1641563596.

The previous prime is 1641563591. The next prime is 1641563683. The reversal of 1641563597 is 7953651461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1152534601 + 489028996 = 33949^2 + 22114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641563597 - 2³⁰ = 567821773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641563591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820781798 + 820781799.

It is an arithmetic number, because the mean of its divisors is an integer number (820781799).

Almost surely, 2^1641563597 is an apocalyptic number.

It is an amenable number.

1641563597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641563597 is an equidigital number, since it uses as much as digits as its factorization.

1641563597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 47.

The square root of 1641563597 is about 40516.2140013106. The cubic root of 1641563597 is about 1179.6483671689.

The spelling of 1641563597 in words is "one billion, six hundred forty-one million, five hundred sixty-three thousand, five hundred ninety-seven".