248889781 has 4 divisors (see below), whose sum is σ = 284445472. Its totient is φ = 213334092.

The previous prime is 248889709. The next prime is 248889799. The reversal of 248889781 is 187988842.

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 not a de Polignac number, because 248889781 - 2⁷ = 248889653 is a prime.

It is a super-2 number, since 2×248889781² = 123892246172455922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (248889181) 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, 17777835 + ... + 17777848.

It is an arithmetic number, because the mean of its divisors is an integer number (71111368).

Almost surely, 2^248889781 is an apocalyptic number.

It is an amenable number.

248889781 is a deficient number, since it is larger than the sum of its proper divisors (35555691).

248889781 is an equidigital number, since it uses as much as digits as its factorization.

248889781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35555690.

The product of its digits is 2064384, while the sum is 55.

The square root of 248889781 is about 15776.2410288383. The cubic root of 248889781 is about 629.0266155962.

The spelling of 248889781 in words is "two hundred forty-eight million, eight hundred eighty-nine thousand, seven hundred eighty-one".