97800019 has 4 divisors (see below), whose sum is σ = 99403360. Its totient is φ = 96196680.

The previous prime is 97800013. The next prime is 97800023. The reversal of 97800019 is 91000879.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91000879 = 7727 ⋅11777.

It is a cyclic number.

It is not a de Polignac number, because 97800019 - 2⁵ = 97799987 is a prime.

It is a super-2 number, since 2×97800019² = 19129687432800722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97800013) 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, 801579 + ... + 801700.

It is an arithmetic number, because the mean of its divisors is an integer number (24850840).

Almost surely, 2^97800019 is an apocalyptic number.

97800019 is a deficient number, since it is larger than the sum of its proper divisors (1603341).

97800019 is a wasteful number, since it uses less digits than its factorization.

97800019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603340.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 97800019 is about 9889.3892126865. The cubic root of 97800019 is about 460.7298103204.

The spelling of 97800019 in words is "ninety-seven million, eight hundred thousand, nineteen".