249983081 has 2 divisors, whose sum is σ = 249983082. Its totient is φ = 249983080.

The previous prime is 249983077. The next prime is 249983087. The reversal of 249983081 is 180389942.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170041600 + 79941481 = 13040^2 + 8941^2 .

It is a cyclic number.

It is not a de Polignac number, because 249983081 - 2² = 249983077 is a prime.

It is a super-2 number, since 2×249983081² = 124983081572505122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (249983087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124991540 + 124991541.

It is an arithmetic number, because the mean of its divisors is an integer number (124991541).

Almost surely, 2^249983081 is an apocalyptic number.

It is an amenable number.

249983081 is a deficient number, since it is larger than the sum of its proper divisors (1).

249983081 is an equidigital number, since it uses as much as digits as its factorization.

249983081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 249983081 is about 15810.8532660322. The cubic root of 249983081 is about 629.9463135573.

The spelling of 249983081 in words is "two hundred forty-nine million, nine hundred eighty-three thousand, eighty-one".