248251391 has 4 divisors (see below), whose sum is σ = 262854432. Its totient is φ = 233648352.

The previous prime is 248251373. The next prime is 248251403. The reversal of 248251391 is 193152842.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193152842 = 2 ⋅96576421.

It is a cyclic number.

It is not a de Polignac number, because 248251391 - 2⁶ = 248251327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (248251331) 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 in 3 ways as a sum of consecutive naturals, for example, 7301495 + ... + 7301528.

It is an arithmetic number, because the mean of its divisors is an integer number (65713608).

Almost surely, 2^248251391 is an apocalyptic number.

248251391 is a deficient number, since it is larger than the sum of its proper divisors (14603041).

248251391 is a wasteful number, since it uses less digits than its factorization.

248251391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14603040.

The product of its digits is 17280, while the sum is 35.

The square root of 248251391 is about 15755.9953985776. The cubic root of 248251391 is about 628.4883477192.

The spelling of 248251391 in words is "two hundred forty-eight million, two hundred fifty-one thousand, three hundred ninety-one".