1251016142 has 4 divisors (see below), whose sum is σ = 1876524216. Its totient is φ = 625508070.

The previous prime is 1251016127. The next prime is 1251016159. The reversal of 1251016142 is 2416101521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2416101521 = 109 ⋅22166069.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 312754034 + ... + 312754037.

It is an arithmetic number, because the mean of its divisors is an integer number (469131054).

Almost surely, 2^1251016142 is an apocalyptic number.

1251016142 is a deficient number, since it is larger than the sum of its proper divisors (625508074).

1251016142 is an equidigital number, since it uses as much as digits as its factorization.

1251016142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625508073.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 1251016142 is about 35369.7065580137. The cubic root of 1251016142 is about 1077.5091608332.

Adding to 1251016142 its reverse (2416101521), we get a palindrome (3667117663).

The spelling of 1251016142 in words is "one billion, two hundred fifty-one million, sixteen thousand, one hundred forty-two".