97878419 has 2 divisors, whose sum is σ = 97878420. Its totient is φ = 97878418.

The previous prime is 97878413. The next prime is 97878421. The reversal of 97878419 is 91487879.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97878419 - 2¹² = 97874323 is a prime.

It is a super-2 number, since 2×97878419² = 19160369811879122, which contains 22 as substring.

Together with 97878421, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (97878413) 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, 48939209 + 48939210.

It is an arithmetic number, because the mean of its divisors is an integer number (48939210).

Almost surely, 2^97878419 is an apocalyptic number.

97878419 is a deficient number, since it is larger than the sum of its proper divisors (1).

97878419 is an equidigital number, since it uses as much as digits as its factorization.

97878419 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1016064, while the sum is 53.

The square root of 97878419 is about 9893.3522630097. The cubic root of 97878419 is about 460.8528899468.

It can be divided in two parts, 978 and 78419, that added together give a palindrome (79397).

The spelling of 97878419 in words is "ninety-seven million, eight hundred seventy-eight thousand, four hundred nineteen".