248780981 has 4 divisors (see below), whose sum is σ = 249699264. Its totient is φ = 247862700.

The previous prime is 248780971. The next prime is 248781019. The reversal of 248780981 is 189087842.

248780981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-248780981 is a prime.

It is a super-2 number, since 2×248780981² = 123783953014644722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (248780971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458735 + ... + 459276.

It is an arithmetic number, because the mean of its divisors is an integer number (62424816).

Almost surely, 2^248780981 is an apocalyptic number.

It is an amenable number.

248780981 is a deficient number, since it is larger than the sum of its proper divisors (918283).

248780981 is an equidigital number, since it uses as much as digits as its factorization.

248780981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918282.

The product of its (nonzero) digits is 258048, while the sum is 47.

The square root of 248780981 is about 15772.7924287363. The cubic root of 248780981 is about 628.9349444017.

The spelling of 248780981 in words is "two hundred forty-eight million, seven hundred eighty thousand, nine hundred eighty-one".