9649234981 has 2 divisors, whose sum is σ = 9649234982. Its totient is φ = 9649234980.

The previous prime is 9649234967. The next prime is 9649235009. The reversal of 9649234981 is 1894329469.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9090669025 + 558565956 = 95345^2 + 23634^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9649234981 is a prime.

It is a super-2 number, since 2×9649234981² (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 (9649234951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4824617490 + 4824617491.

It is an arithmetic number, because the mean of its divisors is an integer number (4824617491).

Almost surely, 2^9649234981 is an apocalyptic number.

It is an amenable number.

9649234981 is a deficient number, since it is larger than the sum of its proper divisors (1).

9649234981 is an equidigital number, since it uses as much as digits as its factorization.

9649234981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3359232, while the sum is 55.

The square root of 9649234981 is about 98230.5196005803. The cubic root of 9649234981 is about 2128.9442762080.

The spelling of 9649234981 in words is "nine billion, six hundred forty-nine million, two hundred thirty-four thousand, nine hundred eighty-one".