250135681 has 2 divisors, whose sum is σ = 250135682. Its totient is φ = 250135680.

The previous prime is 250135663. The next prime is 250135729. The reversal of 250135681 is 186531052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218596225 + 31539456 = 14785^2 + 5616^2 .

It is a cyclic number.

It is not a de Polignac number, because 250135681 - 2⁷ = 250135553 is a prime.

It is a super-2 number, since 2×250135681² = 125135717818667522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (250135661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125067840 + 125067841.

It is an arithmetic number, because the mean of its divisors is an integer number (125067841).

Almost surely, 2^250135681 is an apocalyptic number.

It is an amenable number.

250135681 is a deficient number, since it is larger than the sum of its proper divisors (1).

250135681 is an equidigital number, since it uses as much as digits as its factorization.

250135681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 250135681 is about 15815.6783287977. The cubic root of 250135681 is about 630.0744692351.

The spelling of 250135681 in words is "two hundred fifty million, one hundred thirty-five thousand, six hundred eighty-one".