97839139 has 2 divisors, whose sum is σ = 97839140. Its totient is φ = 97839138.

The previous prime is 97839109. The next prime is 97839143. The reversal of 97839139 is 93193879.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97839139 - 2⁹ = 97838627 is a prime.

It is a super-2 number, since 2×97839139² = 19144994240522642, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 97839092 and 97839101.

It is not a weakly prime, because it can be changed into another prime (97839109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48919569 + 48919570.

It is an arithmetic number, because the mean of its divisors is an integer number (48919570).

Almost surely, 2^97839139 is an apocalyptic number.

97839139 is a deficient number, since it is larger than the sum of its proper divisors (1).

97839139 is an equidigital number, since it uses as much as digits as its factorization.

97839139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 367416, while the sum is 49.

The square root of 97839139 is about 9891.3668923966. The cubic root of 97839139 is about 460.7912327609.

The spelling of 97839139 in words is "ninety-seven million, eight hundred thirty-nine thousand, one hundred thirty-nine".