250749981 has 12 divisors (see below), whose sum is σ = 362577852. Its totient is φ = 166989696.

The previous prime is 250749977. The next prime is 250749991. The reversal of 250749981 is 189947052.

250749981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 226984356 + 23765625 = 15066^2 + 4875^2 .

It is not a de Polignac number, because 250749981 - 2² = 250749977 is a prime.

It is a super-2 number, since 2×250749981² = 125751105943000722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (250749901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5466 + ... + 23051.

It is an arithmetic number, because the mean of its divisors is an integer number (30214821).

Almost surely, 2^250749981 is an apocalyptic number.

It is an amenable number.

250749981 is a deficient number, since it is larger than the sum of its proper divisors (111827871).

250749981 is a wasteful number, since it uses less digits than its factorization.

250749981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29500 (or 29497 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 250749981 is about 15835.0870221796. The cubic root of 250749981 is about 630.5898406325.

The spelling of 250749981 in words is "two hundred fifty million, seven hundred forty-nine thousand, nine hundred eighty-one".