249750981 has 6 divisors (see below), whose sum is σ = 360751430. Its totient is φ = 166500648.

The previous prime is 249750979. The next prime is 249750989. The reversal of 249750981 is 189057942.

It can be written as a sum of positive squares in only one way, i.e., 144360225 + 105390756 = 12015^2 + 10266^2 .

It is not a de Polignac number, because 249750981 - 2¹ = 249750979 is a prime.

It is a super-2 number, since 2×249750981² = 124751105020924722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (249750989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13875046 + ... + 13875063.

Almost surely, 2^249750981 is an apocalyptic number.

It is an amenable number.

249750981 is a deficient number, since it is larger than the sum of its proper divisors (111000449).

249750981 is a wasteful number, since it uses less digits than its factorization.

249750981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27750115 (or 27750112 counting only the distinct ones).

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

The square root of 249750981 is about 15803.5116667151. The cubic root of 249750981 is about 629.7512926083.

The spelling of 249750981 in words is "two hundred forty-nine million, seven hundred fifty thousand, nine hundred eighty-one".