9897203581 has 2 divisors, whose sum is σ = 9897203582. Its totient is φ = 9897203580.

The previous prime is 9897203573. The next prime is 9897203621. The reversal of 9897203581 is 1853027989.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6734828356 + 3162375225 = 82066^2 + 56235^2 .

It is a cyclic number.

It is not a de Polignac number, because 9897203581 - 2³ = 9897203573 is a prime.

It is a super-2 number, since 2×9897203581² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9897203501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4948601790 + 4948601791.

It is an arithmetic number, because the mean of its divisors is an integer number (4948601791).

Almost surely, 2^9897203581 is an apocalyptic number.

It is an amenable number.

9897203581 is a deficient number, since it is larger than the sum of its proper divisors (1).

9897203581 is an equidigital number, since it uses as much as digits as its factorization.

9897203581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The square root of 9897203581 is about 99484.6901839675. The cubic root of 9897203581 is about 2147.0269764972.

The spelling of 9897203581 in words is "nine billion, eight hundred ninety-seven million, two hundred three thousand, five hundred eighty-one".