1251533122 has 16 divisors (see below), whose sum is σ = 2146000320. Its totient is φ = 536242608.

The previous prime is 1251533119. The next prime is 1251533123. The reversal of 1251533122 is 2213351521.

It is not an unprimeable number, because it can be changed into a prime (1251533123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71328 + ... + 87124.

It is an arithmetic number, because the mean of its divisors is an integer number (134125020).

Almost surely, 2^1251533122 is an apocalyptic number.

1251533122 is a deficient number, since it is larger than the sum of its proper divisors (894467198).

1251533122 is a wasteful number, since it uses less digits than its factorization.

1251533122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21465.

The product of its digits is 1800, while the sum is 25.

The square root of 1251533122 is about 35377.0140345394. The cubic root of 1251533122 is about 1077.6575665842.

Adding to 1251533122 its reverse (2213351521), we get a palindrome (3464884643).

The spelling of 1251533122 in words is "one billion, two hundred fifty-one million, five hundred thirty-three thousand, one hundred twenty-two".