97907819 has 4 divisors (see below), whose sum is σ = 99249096. Its totient is φ = 96566544.

The previous prime is 97907813. The next prime is 97907839. The reversal of 97907819 is 91870979.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 97907819 - 2¹² = 97903723 is a prime.

It is a super-2 number, since 2×97907819² = 19171882042673522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97907813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670529 + ... + 670674.

It is an arithmetic number, because the mean of its divisors is an integer number (24812274).

Almost surely, 2^97907819 is an apocalyptic number.

97907819 is a deficient number, since it is larger than the sum of its proper divisors (1341277).

97907819 is a wasteful number, since it uses less digits than its factorization.

97907819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1341276.

The product of its (nonzero) digits is 285768, while the sum is 50.

The square root of 97907819 is about 9894.8379976632. The cubic root of 97907819 is about 460.8990278621.

The spelling of 97907819 in words is "ninety-seven million, nine hundred seven thousand, eight hundred nineteen".