249696661 has 4 divisors (see below), whose sum is σ = 257751424. Its totient is φ = 241641900.

The previous prime is 249696659. The next prime is 249696701. The reversal of 249696661 is 166696942.

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 not a de Polignac number, because 249696661 - 2¹ = 249696659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249696631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4027335 + ... + 4027396.

It is an arithmetic number, because the mean of its divisors is an integer number (64437856).

Almost surely, 2^249696661 is an apocalyptic number.

It is an amenable number.

249696661 is a deficient number, since it is larger than the sum of its proper divisors (8054763).

249696661 is an equidigital number, since it uses as much as digits as its factorization.

249696661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8054762.

The product of its digits is 839808, while the sum is 49.

The square root of 249696661 is about 15801.7929678882. The cubic root of 249696661 is about 629.7056330338.

The spelling of 249696661 in words is "two hundred forty-nine million, six hundred ninety-six thousand, six hundred sixty-one".