9771980251 has 16 divisors (see below), whose sum is σ = 10809520128. Its totient is φ = 8760168000.

The previous prime is 9771980249. The next prime is 9771980279. The reversal of 9771980251 is 1520891779.

It is a cyclic number.

It is not a de Polignac number, because 9771980251 - 2¹ = 9771980249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9771980195 and 9771980204.

It is not an unprimeable number, because it can be changed into a prime (9771980051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 206086 + ... + 249028.

It is an arithmetic number, because the mean of its divisors is an integer number (675595008).

Almost surely, 2^9771980251 is an apocalyptic number.

9771980251 is a deficient number, since it is larger than the sum of its proper divisors (1037539877).

9771980251 is a wasteful number, since it uses less digits than its factorization.

9771980251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43242.

The product of its (nonzero) digits is 317520, while the sum is 49.

The square root of 9771980251 is about 98853.3269596932. The cubic root of 9771980251 is about 2137.9335053903.

The spelling of 9771980251 in words is "nine billion, seven hundred seventy-one million, nine hundred eighty thousand, two hundred fifty-one".