1251131442 has 32 divisors (see below), whose sum is σ = 2731622400. Its totient is φ = 378869520.

The previous prime is 1251131423. The next prime is 1251131443. The reversal of 1251131442 is 2441311521.

It is not an unprimeable number, because it can be changed into a prime (1251131443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104059 + ... + 115457.

It is an arithmetic number, because the mean of its divisors is an integer number (85363200).

Almost surely, 2^1251131442 is an apocalyptic number.

1251131442 is an abundant number, since it is smaller than the sum of its proper divisors (1480490958).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1251131442 is a wasteful number, since it uses less digits than its factorization.

1251131442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13078.

The product of its digits is 960, while the sum is 24.

The square root of 1251131442 is about 35371.3364463374. The cubic root of 1251131442 is about 1077.5422627214.

Adding to 1251131442 its reverse (2441311521), we get a palindrome (3692442963).

The spelling of 1251131442 in words is "one billion, two hundred fifty-one million, one hundred thirty-one thousand, four hundred forty-two".