248878139 has 2 divisors, whose sum is σ = 248878140. Its totient is φ = 248878138.

The previous prime is 248878121. The next prime is 248878141. The reversal of 248878139 is 931878842.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 248878139 - 2⁸ = 248877883 is a prime.

Together with 248878141, 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 (248878639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124439069 + 124439070.

It is an arithmetic number, because the mean of its divisors is an integer number (124439070).

Almost surely, 2^248878139 is an apocalyptic number.

248878139 is a deficient number, since it is larger than the sum of its proper divisors (1).

248878139 is an equidigital number, since it uses as much as digits as its factorization.

248878139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 774144, while the sum is 50.

The square root of 248878139 is about 15775.8720519659. The cubic root of 248878139 is about 629.0168077179.

The spelling of 248878139 in words is "two hundred forty-eight million, eight hundred seventy-eight thousand, one hundred thirty-nine".