249655961 has 4 divisors (see below), whose sum is σ = 260510592. Its totient is φ = 238801332.

The previous prime is 249655957. The next prime is 249655969. The reversal of 249655961 is 169556942.

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 249655961 - 2² = 249655957 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249655969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5427281 + ... + 5427326.

It is an arithmetic number, because the mean of its divisors is an integer number (65127648).

Almost surely, 2^249655961 is an apocalyptic number.

It is an amenable number.

249655961 is a deficient number, since it is larger than the sum of its proper divisors (10854631).

249655961 is a wasteful number, since it uses less digits than its factorization.

249655961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10854630.

The product of its digits is 583200, while the sum is 47.

The square root of 249655961 is about 15800.5050868635. The cubic root of 249655961 is about 629.6714176359.

The spelling of 249655961 in words is "two hundred forty-nine million, six hundred fifty-five thousand, nine hundred sixty-one".