97857779 has 2 divisors, whose sum is σ = 97857780. Its totient is φ = 97857778.

The previous prime is 97857757. The next prime is 97857811. The reversal of 97857779 is 97775879.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97857779 - 2⁸ = 97857523 is a prime.

It is a super-2 number, since 2×97857779² = 19152289821625682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (97857679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48928889 + 48928890.

It is an arithmetic number, because the mean of its divisors is an integer number (48928890).

Almost surely, 2^97857779 is an apocalyptic number.

97857779 is a deficient number, since it is larger than the sum of its proper divisors (1).

97857779 is an equidigital number, since it uses as much as digits as its factorization.

97857779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7779240, while the sum is 59.

The square root of 97857779 is about 9892.3090833233. The cubic root of 97857779 is about 460.8204937270.

The spelling of 97857779 in words is "ninety-seven million, eight hundred fifty-seven thousand, seven hundred seventy-nine".