248978491 has 2 divisors, whose sum is σ = 248978492. Its totient is φ = 248978490.

The previous prime is 248978449. The next prime is 248978497. The reversal of 248978491 is 194879842.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 248978491 - 2²³ = 240589883 is a prime.

It is not a weakly prime, because it can be changed into another prime (248978497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124489245 + 124489246.

It is an arithmetic number, because the mean of its divisors is an integer number (124489246).

Almost surely, 2^248978491 is an apocalyptic number.

248978491 is a deficient number, since it is larger than the sum of its proper divisors (1).

248978491 is an equidigital number, since it uses as much as digits as its factorization.

248978491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 52.

The square root of 248978491 is about 15779.0522845955. The cubic root of 248978491 is about 629.1013398678.

The spelling of 248978491 in words is "two hundred forty-eight million, nine hundred seventy-eight thousand, four hundred ninety-one".