97930815 has 16 divisors (see below), whose sum is σ = 156816000. Its totient is φ = 52187552.

The previous prime is 97930813. The next prime is 97930817. The reversal of 97930815 is 51803979.

It is a happy number.

It is a Cunningham number, because it is equal to 9896²-1.

It is an interprime number because it is at equal distance from previous prime (97930813) and next prime (97930817).

It is a cyclic number.

It is not a de Polignac number, because 97930815 - 2¹ = 97930813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97930813) 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 15 ways as a sum of consecutive naturals, for example, 28036 + ... + 31334.

It is an arithmetic number, because the mean of its divisors is an integer number (9801000).

Almost surely, 2^97930815 is an apocalyptic number.

97930815 is a deficient number, since it is larger than the sum of its proper divisors (58885185).

97930815 is a wasteful number, since it uses less digits than its factorization.

97930815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5286.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 97930815 is about 9895.9999494745. Note that the first 4 decimals coincide. The cubic root of 97930815 is about 460.9351094351.

The spelling of 97930815 in words is "ninety-seven million, nine hundred thirty thousand, eight hundred fifteen".