7948999897 has 2 divisors, whose sum is σ = 7948999898. Its totient is φ = 7948999896.

The previous prime is 7948999831. The next prime is 7948999901. The reversal of 7948999897 is 7989998497.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5990140816 + 1958859081 = 77396^2 + 44259^2 .

It is a cyclic number.

It is not a de Polignac number, because 7948999897 - 2⁷ = 7948999769 is a prime.

It is not a weakly prime, because it can be changed into another prime (7948999397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3974499948 + 3974499949.

It is an arithmetic number, because the mean of its divisors is an integer number (3974499949).

Almost surely, 2^7948999897 is an apocalyptic number.

It is an amenable number.

7948999897 is a deficient number, since it is larger than the sum of its proper divisors (1).

7948999897 is an equidigital number, since it uses as much as digits as its factorization.

7948999897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 740710656, while the sum is 79.

The square root of 7948999897 is about 89157.1640251079. The cubic root of 7948999897 is about 1995.7409280077.

The spelling of 7948999897 in words is "seven billion, nine hundred forty-eight million, nine hundred ninety-nine thousand, eight hundred ninety-seven".