9806249897 has 4 divisors (see below), whose sum is σ = 10071283716. Its totient is φ = 9541216080.

The previous prime is 9806249881. The next prime is 9806249903. The reversal of 9806249897 is 7989426089.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5694362521 + 4111887376 = 75461^2 + 64124^2 .

It is a cyclic number.

It is not a de Polignac number, because 9806249897 - 2⁴ = 9806249881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9806249807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132516854 + ... + 132516927.

It is an arithmetic number, because the mean of its divisors is an integer number (2517820929).

Almost surely, 2^9806249897 is an apocalyptic number.

It is an amenable number.

9806249897 is a deficient number, since it is larger than the sum of its proper divisors (265033819).

9806249897 is a wasteful number, since it uses less digits than its factorization.

9806249897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265033818.

The product of its (nonzero) digits is 15676416, while the sum is 62.

The square root of 9806249897 is about 99026.5110816290. The cubic root of 9806249897 is about 2140.4297836097.

The spelling of 9806249897 in words is "nine billion, eight hundred six million, two hundred forty-nine thousand, eight hundred ninety-seven".