249992081 has 2 divisors, whose sum is σ = 249992082. Its totient is φ = 249992080.

The previous prime is 249992059. The next prime is 249992087. The reversal of 249992081 is 180299942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249924481 + 67600 = 15809^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 249992081 - 2¹⁰ = 249991057 is a prime.

It is a super-2 number, since 2×249992081² = 124992081125421122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (249992087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124996040 + 124996041.

It is an arithmetic number, because the mean of its divisors is an integer number (124996041).

Almost surely, 2^249992081 is an apocalyptic number.

It is an amenable number.

249992081 is a deficient number, since it is larger than the sum of its proper divisors (1).

249992081 is an equidigital number, since it uses as much as digits as its factorization.

249992081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 249992081 is about 15811.1378780909. The cubic root of 249992081 is about 629.9538733340.

The spelling of 249992081 in words is "two hundred forty-nine million, nine hundred ninety-two thousand, eighty-one".