249962981 has 4 divisors (see below), whose sum is σ = 252437964. Its totient is φ = 247488000.

The previous prime is 249962971. The next prime is 249962983. The reversal of 249962981 is 189269942.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 159617956 + 90345025 = 12634^2 + 9505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249962981 is a prime.

It is a super-2 number, since 2×249962981² = 124962983740812722, 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 (249962983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1237340 + ... + 1237541.

It is an arithmetic number, because the mean of its divisors is an integer number (63109491).

Almost surely, 2^249962981 is an apocalyptic number.

It is an amenable number.

249962981 is a deficient number, since it is larger than the sum of its proper divisors (2474983).

249962981 is a wasteful number, since it uses less digits than its factorization.

249962981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2474982.

The product of its digits is 559872, while the sum is 50.

The square root of 249962981 is about 15810.2176139356. The cubic root of 249962981 is about 629.9294294010.

The spelling of 249962981 in words is "two hundred forty-nine million, nine hundred sixty-two thousand, nine hundred eighty-one".