9702771681 has 4 divisors (see below), whose sum is σ = 12937028912. Its totient is φ = 6468514452.

The previous prime is 9702771649. The next prime is 9702771721. The reversal of 9702771681 is 1861772079.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1861772079 = 3 ⋅620590693.

It is not a de Polignac number, because 9702771681 - 2⁵ = 9702771649 is a prime.

It is a super-2 number, since 2×9702771681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9702771681.

It is not an unprimeable number, because it can be changed into a prime (9702778681) 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, 1617128611 + ... + 1617128616.

It is an arithmetic number, because the mean of its divisors is an integer number (3234257228).

Almost surely, 2^9702771681 is an apocalyptic number.

It is an amenable number.

9702771681 is a deficient number, since it is larger than the sum of its proper divisors (3234257231).

9702771681 is a wasteful number, since it uses less digits than its factorization.

9702771681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3234257230.

The product of its (nonzero) digits is 296352, while the sum is 48.

The square root of 9702771681 is about 98502.6480913077. The cubic root of 9702771681 is about 2132.8743462076.

The spelling of 9702771681 in words is "nine billion, seven hundred two million, seven hundred seventy-one thousand, six hundred eighty-one".