97871779 has 2 divisors, whose sum is σ = 97871780. Its totient is φ = 97871778.

The previous prime is 97871777. The next prime is 97871783. The reversal of 97871779 is 97717879.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97871779 - 2¹ = 97871777 is a prime.

Together with 97871777, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (97871777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48935889 + 48935890.

It is an arithmetic number, because the mean of its divisors is an integer number (48935890).

Almost surely, 2^97871779 is an apocalyptic number.

97871779 is a deficient number, since it is larger than the sum of its proper divisors (1).

97871779 is an equidigital number, since it uses as much as digits as its factorization.

97871779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555848, while the sum is 55.

The square root of 97871779 is about 9893.0166784455. The cubic root of 97871779 is about 460.8424684041.

The spelling of 97871779 in words is "ninety-seven million, eight hundred seventy-one thousand, seven hundred seventy-nine".