97890976439 has 2 divisors, whose sum is σ = 97890976440. Its totient is φ = 97890976438.

The previous prime is 97890976333. The next prime is 97890976493. The reversal of 97890976439 is 93467909879.

Together with next prime (97890976493) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97890976439 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97890976739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48945488219 + 48945488220.

It is an arithmetic number, because the mean of its divisors is an integer number (48945488220).

Almost surely, 2^97890976439 is an apocalyptic number.

97890976439 is a deficient number, since it is larger than the sum of its proper divisors (1).

97890976439 is an equidigital number, since it uses as much as digits as its factorization.

97890976439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 185177664, while the sum is 71.

The spelling of 97890976439 in words is "ninety-seven billion, eight hundred ninety million, nine hundred seventy-six thousand, four hundred thirty-nine".