249346661 has 2 divisors, whose sum is σ = 249346662. Its totient is φ = 249346660.

The previous prime is 249346639. The next prime is 249346687. The reversal of 249346661 is 166643942.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246301636 + 3045025 = 15694^2 + 1745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249346661 is a prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249346621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124673330 + 124673331.

It is an arithmetic number, because the mean of its divisors is an integer number (124673331).

Almost surely, 2^249346661 is an apocalyptic number.

It is an amenable number.

249346661 is a deficient number, since it is larger than the sum of its proper divisors (1).

249346661 is an equidigital number, since it uses as much as digits as its factorization.

249346661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 41.

The square root of 249346661 is about 15790.7143916924. The cubic root of 249346661 is about 629.4112758355.

The spelling of 249346661 in words is "two hundred forty-nine million, three hundred forty-six thousand, six hundred sixty-one".