251940530 has 8 divisors (see below), whose sum is σ = 453492972. Its totient is φ = 100776208.

The previous prime is 251940523. The next prime is 251940547. The reversal of 251940530 is 35049152.

It can be written as a sum of positive squares in 2 ways, for example, as 250683889 + 1256641 = 15833^2 + 1121^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 251940493 and 251940502.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12597017 + ... + 12597036.

Almost surely, 2^251940530 is an apocalyptic number.

251940530 is a deficient number, since it is larger than the sum of its proper divisors (201552442).

251940530 is a wasteful number, since it uses less digits than its factorization.

251940530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25194060.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 251940530 is about 15872.6346269295. The cubic root of 251940530 is about 631.5862688320.

Adding to 251940530 its reverse (35049152), we get a palindrome (286989682).

The spelling of 251940530 in words is "two hundred fifty-one million, nine hundred forty thousand, five hundred thirty".