1251232142 has 4 divisors (see below), whose sum is σ = 1876848216. Its totient is φ = 625616070.

The previous prime is 1251232133. The next prime is 1251232153. The reversal of 1251232142 is 2412321521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2412321521 = 6971 ⋅346051.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 312808034 + ... + 312808037.

It is an arithmetic number, because the mean of its divisors is an integer number (469212054).

Almost surely, 2^1251232142 is an apocalyptic number.

1251232142 is a deficient number, since it is larger than the sum of its proper divisors (625616074).

1251232142 is an equidigital number, since it uses as much as digits as its factorization.

1251232142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625616073.

The product of its digits is 960, while the sum is 23.

The square root of 1251232142 is about 35372.7598866699. The cubic root of 1251232142 is about 1077.5711713800.

Adding to 1251232142 its reverse (2412321521), we get a palindrome (3663553663).

The spelling of 1251232142 in words is "one billion, two hundred fifty-one million, two hundred thirty-two thousand, one hundred forty-two".