248477639 has 2 divisors, whose sum is σ = 248477640. Its totient is φ = 248477638.

The previous prime is 248477591. The next prime is 248477641. The reversal of 248477639 is 936774842.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 248477639 - 2¹² = 248473543 is a prime.

It is a super-2 number, since 2×248477639² = 123482274166028642, which contains 22 as substring.

Together with 248477641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (248407639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124238819 + 124238820.

It is an arithmetic number, because the mean of its divisors is an integer number (124238820).

Almost surely, 2^248477639 is an apocalyptic number.

248477639 is a deficient number, since it is larger than the sum of its proper divisors (1).

248477639 is an equidigital number, since it uses as much as digits as its factorization.

248477639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 50.

The square root of 248477639 is about 15763.1735066261. The cubic root of 248477639 is about 628.6792174876.

The spelling of 248477639 in words is "two hundred forty-eight million, four hundred seventy-seven thousand, six hundred thirty-nine".