248109991 has 8 divisors (see below), whose sum is σ = 254545200. Its totient is φ = 241756992.

The previous prime is 248109989. The next prime is 248110001. The reversal of 248109991 is 199901842.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 248109991 - 2¹ = 248109989 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 (248109941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14416 + ... + 26533.

It is an arithmetic number, because the mean of its divisors is an integer number (31818150).

Almost surely, 2^248109991 is an apocalyptic number.

248109991 is a deficient number, since it is larger than the sum of its proper divisors (6435209).

248109991 is an equidigital number, since it uses as much as digits as its factorization.

248109991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41105.

The product of its (nonzero) digits is 46656, while the sum is 43.

The square root of 248109991 is about 15751.5075786415. The cubic root of 248109991 is about 628.3689994381.

The spelling of 248109991 in words is "two hundred forty-eight million, one hundred nine thousand, nine hundred ninety-one".