250513981 has 2 divisors, whose sum is σ = 250513982. Its totient is φ = 250513980.

The previous prime is 250513979. The next prime is 250514063. The reversal of 250513981 is 189315052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151511481 + 99002500 = 12309^2 + 9950^2 .

It is a cyclic number.

It is not a de Polignac number, because 250513981 - 2¹ = 250513979 is a prime.

It is a super-2 number, since 2×250513981² = 125514509352936722, which contains 22 as substring.

Together with 250513979, it forms a pair of twin primes.

It is equal to p_13705882 and since 250513981 and 13705882 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (250513931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125256990 + 125256991.

It is an arithmetic number, because the mean of its divisors is an integer number (125256991).

Almost surely, 2^250513981 is an apocalyptic number.

It is an amenable number.

250513981 is a deficient number, since it is larger than the sum of its proper divisors (1).

250513981 is an equidigital number, since it uses as much as digits as its factorization.

250513981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 250513981 is about 15827.6334617655. The cubic root of 250513981 is about 630.3919464132.

The spelling of 250513981 in words is "two hundred fifty million, five hundred thirteen thousand, nine hundred eighty-one".