97807819 has 2 divisors, whose sum is σ = 97807820. Its totient is φ = 97807818.

The previous prime is 97807811. The next prime is 97807823. The reversal of 97807819 is 91870879.

It is a strong prime.

It is an emirp because it is prime and its reverse (91870879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97807819 - 2³ = 97807811 is a prime.

It is a super-2 number, since 2×97807819² = 19132738915073522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97807811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48903909 + 48903910.

It is an arithmetic number, because the mean of its divisors is an integer number (48903910).

Almost surely, 2^97807819 is an apocalyptic number.

97807819 is a deficient number, since it is larger than the sum of its proper divisors (1).

97807819 is an equidigital number, since it uses as much as digits as its factorization.

97807819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 97807819 is about 9889.7835668937. The cubic root of 97807819 is about 460.7420584332.

The spelling of 97807819 in words is "ninety-seven million, eight hundred seven thousand, eight hundred nineteen".