249903161 has 2 divisors, whose sum is σ = 249903162. Its totient is φ = 249903160.

The previous prime is 249903151. The next prime is 249903167. The reversal of 249903161 is 161309942.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130416400 + 119486761 = 11420^2 + 10931^2 .

It is a cyclic number.

It is not a de Polignac number, because 249903161 - 2⁶ = 249903097 is a prime.

It is not a weakly prime, because it can be changed into another prime (249903167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124951580 + 124951581.

It is an arithmetic number, because the mean of its divisors is an integer number (124951581).

Almost surely, 2^249903161 is an apocalyptic number.

It is an amenable number.

249903161 is a deficient number, since it is larger than the sum of its proper divisors (1).

249903161 is an equidigital number, since it uses as much as digits as its factorization.

249903161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 249903161 is about 15808.3256861693. The cubic root of 249903161 is about 629.8791747797.

The spelling of 249903161 in words is "two hundred forty-nine million, nine hundred three thousand, one hundred sixty-one".