249281961 has 4 divisors (see below), whose sum is σ = 332375952. Its totient is φ = 166187972.

The previous prime is 249281959. The next prime is 249281971. The reversal of 249281961 is 169182942.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 249281961 - 2¹ = 249281959 is a prime.

It is not an unprimeable number, because it can be changed into a prime (249281971) 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, 41546991 + ... + 41546996.

It is an arithmetic number, because the mean of its divisors is an integer number (83093988).

Almost surely, 2^249281961 is an apocalyptic number.

It is an amenable number.

249281961 is a deficient number, since it is larger than the sum of its proper divisors (83093991).

249281961 is an equidigital number, since it uses as much as digits as its factorization.

249281961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83093990.

The product of its digits is 62208, while the sum is 42.

The square root of 249281961 is about 15788.6655864262. The cubic root of 249281961 is about 629.3568316437.

The spelling of 249281961 in words is "two hundred forty-nine million, two hundred eighty-one thousand, nine hundred sixty-one".