249492961 has 4 divisors (see below), whose sum is σ = 256236052. Its totient is φ = 242749872.

The previous prime is 249492959. The next prime is 249493001. The reversal of 249492961 is 169294942.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 189585361 + 59907600 = 13769^2 + 7740^2 .

It is a cyclic number.

It is not a de Polignac number, because 249492961 - 2¹ = 249492959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249492911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3371490 + ... + 3371563.

It is an arithmetic number, because the mean of its divisors is an integer number (64059013).

Almost surely, 2^249492961 is an apocalyptic number.

It is an amenable number.

249492961 is a deficient number, since it is larger than the sum of its proper divisors (6743091).

249492961 is an equidigital number, since it uses as much as digits as its factorization.

249492961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6743090.

The product of its digits is 279936, while the sum is 46.

The square root of 249492961 is about 15795.3461817081. The cubic root of 249492961 is about 629.5343506286.

The spelling of 249492961 in words is "two hundred forty-nine million, four hundred ninety-two thousand, nine hundred sixty-one".