250629981 has 8 divisors (see below), whose sum is σ = 381912384. Its totient is φ = 143217120.

The previous prime is 250629959. The next prime is 250629983. The reversal of 250629981 is 189926052.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 250629981 - 2²² = 246435677 is a prime.

It is a super-2 number, since 2×250629981² = 125630774752120722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (250629983) 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 in 7 ways as a sum of consecutive naturals, for example, 5967360 + ... + 5967401.

It is an arithmetic number, because the mean of its divisors is an integer number (47739048).

Almost surely, 2^250629981 is an apocalyptic number.

250629981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

250629981 is a deficient number, since it is larger than the sum of its proper divisors (131282403).

250629981 is a wasteful number, since it uses less digits than its factorization.

250629981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11934771.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 250629981 is about 15831.2975147333. The cubic root of 250629981 is about 630.4892319773.

The spelling of 250629981 in words is "two hundred fifty million, six hundred twenty-nine thousand, nine hundred eighty-one".