7998798097 has 4 divisors (see below), whose sum is σ = 7999058740. Its totient is φ = 7998537456.

The previous prime is 7998798089. The next prime is 7998798109. The reversal of 7998798097 is 7908978997.

It is a Cunningham number, because it is equal to 89436²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7908978997 = 191 ⋅41408267.

It can be written as a sum of positive squares in 2 ways, for example, as 374190336 + 7624607761 = 19344^2 + 87319^2 .

It is a cyclic number.

It is not a de Polignac number, because 7998798097 - 2³ = 7998798089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7998798007) 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, 77022 + ... + 148087.

It is an arithmetic number, because the mean of its divisors is an integer number (1999764685).

Almost surely, 2^7998798097 is an apocalyptic number.

It is an amenable number.

7998798097 is a deficient number, since it is larger than the sum of its proper divisors (260643).

7998798097 is a wasteful number, since it uses less digits than its factorization.

7998798097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260642.

The product of its (nonzero) digits is 144027072, while the sum is 73.

The square root of 7998798097 is about 89436.0000055906. Note that the first 5 decimals coincide. The cubic root of 7998798097 is about 1999.8998364004.

It can be divided in two parts, 79987 and 98097, that added together give a square (178084 = 422²).

The spelling of 7998798097 in words is "seven billion, nine hundred ninety-eight million, seven hundred ninety-eight thousand, ninety-seven".