9797979797 has 16 divisors (see below), whose sum is σ = 10178966784. Its totient is φ = 9424512000.

The previous prime is 9797979781. The next prime is 9797979803. The reversal of 9797979797 is 7979797979.

It is a cyclic number.

It is not a de Polignac number, because 9797979797 - 2⁴ = 9797979781 is a prime.

It is a super-2 number, since 2×9797979797² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

9797979797 is an undulating number in base 10.

9797979797 is a modest number, since divided by 979797 gives 9797 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9797919797) 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, 1073222 + ... + 1082312.

It is an arithmetic number, because the mean of its divisors is an integer number (636185424).

Almost surely, 2^9797979797 is an apocalyptic number.

9797979797 is a gapful number since it is divisible by the number (97) formed by its first and last digit.

It is an amenable number.

9797979797 is a deficient number, since it is larger than the sum of its proper divisors (380986987).

9797979797 is a wasteful number, since it uses less digits than its factorization.

9797979797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9500.

The product of its digits is 992436543, while the sum is 80.

The square root of 9797979797 is about 98984.7452742088. The cubic root of 9797979797 is about 2139.8279039555.

The spelling of 9797979797 in words is "nine billion, seven hundred ninety-seven million, nine hundred seventy-nine thousand, seven hundred ninety-seven".