250689661 has 2 divisors, whose sum is σ = 250689662. Its totient is φ = 250689660.

The previous prime is 250689641. The next prime is 250689671. The reversal of 250689661 is 166986052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 250240761 + 448900 = 15819^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 250689661 - 2⁷ = 250689533 is a prime.

It is a super-2 number, since 2×250689661² = 125690612264589842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (250689641) 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, 125344830 + 125344831.

It is an arithmetic number, because the mean of its divisors is an integer number (125344831).

Almost surely, 2^250689661 is an apocalyptic number.

It is an amenable number.

250689661 is a deficient number, since it is larger than the sum of its proper divisors (1).

250689661 is an equidigital number, since it uses as much as digits as its factorization.

250689661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 250689661 is about 15833.1822764724. The cubic root of 250689661 is about 630.5392720283.

The spelling of 250689661 in words is "two hundred fifty million, six hundred eighty-nine thousand, six hundred sixty-one".