250505261 has 2 divisors, whose sum is σ = 250505262. Its totient is φ = 250505260.

The previous prime is 250505249. The next prime is 250505273. The reversal of 250505261 is 162505052.

It is a balanced prime because it is at equal distance from previous prime (250505249) and next prime (250505273).

It can be written as a sum of positive squares in only one way, i.e., 206813161 + 43692100 = 14381^2 + 6610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-250505261 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 250505261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (250501261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125252630 + 125252631.

It is an arithmetic number, because the mean of its divisors is an integer number (125252631).

Almost surely, 2^250505261 is an apocalyptic number.

It is an amenable number.

250505261 is a deficient number, since it is larger than the sum of its proper divisors (1).

250505261 is an equidigital number, since it uses as much as digits as its factorization.

250505261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 250505261 is about 15827.3579917812. The cubic root of 250505261 is about 630.3846320090.

The spelling of 250505261 in words is "two hundred fifty million, five hundred five thousand, two hundred sixty-one".