251513132 has 24 divisors (see below), whose sum is σ = 475398000. Its totient is φ = 115742016.

The previous prime is 251513131. The next prime is 251513153. The reversal of 251513132 is 231315152.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 251513098 and 251513107.

It is not an unprimeable number, because it can be changed into a prime (251513131) 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, 11219 + ... + 25077.

It is an arithmetic number, because the mean of its divisors is an integer number (19808250).

Almost surely, 2^251513132 is an apocalyptic number.

It is an amenable number.

251513132 is a deficient number, since it is larger than the sum of its proper divisors (223884868).

251513132 is a wasteful number, since it uses less digits than its factorization.

251513132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14225 (or 14223 counting only the distinct ones).

The product of its digits is 900, while the sum is 23.

The square root of 251513132 is about 15859.1655518189. The cubic root of 251513132 is about 631.2289206175.

Adding to 251513132 its reverse (231315152), we get a palindrome (482828284).

The spelling of 251513132 in words is "two hundred fifty-one million, five hundred thirteen thousand, one hundred thirty-two".