97930813 has 2 divisors, whose sum is σ = 97930814. Its totient is φ = 97930812.

The previous prime is 97930801. The next prime is 97930817. The reversal of 97930813 is 31803979.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54199044 + 43731769 = 7362^2 + 6613^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97930813 is a prime.

It is a super-3 number, since 3×97930813³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97930817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48965406 + 48965407.

It is an arithmetic number, because the mean of its divisors is an integer number (48965407).

Almost surely, 2^97930813 is an apocalyptic number.

It is an amenable number.

97930813 is a deficient number, since it is larger than the sum of its proper divisors (1).

97930813 is an equidigital number, since it uses as much as digits as its factorization.

97930813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 97930813 is about 9895.9998484236. Note that the first 3 decimals coincide. The cubic root of 97930813 is about 460.9351062973.

It can be divided in two parts, 9 and 7930813, that multiplied together give a palindrome (71377317).

The spelling of 97930813 in words is "ninety-seven million, nine hundred thirty thousand, eight hundred thirteen".