9997851049 has 2 divisors, whose sum is σ = 9997851050. Its totient is φ = 9997851048.

The previous prime is 9997851001. The next prime is 9997851151. The reversal of 9997851049 is 9401587999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6063425424 + 3934425625 = 77868^2 + 62725^2 .

It is a cyclic number.

It is not a de Polignac number, because 9997851049 - 2⁷ = 9997850921 is a prime.

It is not a weakly prime, because it can be changed into another prime (9997851349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4998925524 + 4998925525.

It is an arithmetic number, because the mean of its divisors is an integer number (4998925525).

Almost surely, 2^9997851049 is an apocalyptic number.

It is an amenable number.

9997851049 is a deficient number, since it is larger than the sum of its proper divisors (1).

9997851049 is an equidigital number, since it uses as much as digits as its factorization.

9997851049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7348320, while the sum is 61.

The square root of 9997851049 is about 99989.2546676892. The cubic root of 9997851049 is about 2154.2803531566.

The spelling of 9997851049 in words is "nine billion, nine hundred ninety-seven million, eight hundred fifty-one thousand, forty-nine".