249511081 has 2 divisors, whose sum is σ = 249511082. Its totient is φ = 249511080.

The previous prime is 249511037. The next prime is 249511127. The reversal of 249511081 is 180115942.

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., 249008400 + 502681 = 15780^2 + 709^2 .

It is a cyclic number.

It is not a de Polignac number, because 249511081 - 2²³ = 241122473 is a prime.

It is a super-3 number, since 3×249511081³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (249511181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124755540 + 124755541.

It is an arithmetic number, because the mean of its divisors is an integer number (124755541).

Almost surely, 2^249511081 is an apocalyptic number.

It is an amenable number.

249511081 is a deficient number, since it is larger than the sum of its proper divisors (1).

249511081 is an equidigital number, since it uses as much as digits as its factorization.

249511081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 249511081 is about 15795.9197579628. The cubic root of 249511081 is about 629.5495907196.

The spelling of 249511081 in words is "two hundred forty-nine million, five hundred eleven thousand, eighty-one".