250135661 has 2 divisors, whose sum is σ = 250135662. Its totient is φ = 250135660.

The previous prime is 250135609. The next prime is 250135663. The reversal of 250135661 is 166531052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 177715561 + 72420100 = 13331^2 + 8510^2 .

It is a cyclic number.

It is not a de Polignac number, because 250135661 - 2⁶ = 250135597 is a prime.

It is a Sophie Germain prime.

Together with 250135663, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (250135663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125067830 + 125067831.

It is an arithmetic number, because the mean of its divisors is an integer number (125067831).

Almost surely, 2^250135661 is an apocalyptic number.

It is an amenable number.

250135661 is a deficient number, since it is larger than the sum of its proper divisors (1).

250135661 is an equidigital number, since it uses as much as digits as its factorization.

250135661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 250135661 is about 15815.6776965137. The cubic root of 250135661 is about 630.0744524423.

The spelling of 250135661 in words is "two hundred fifty million, one hundred thirty-five thousand, six hundred sixty-one".