1251142011 has 16 divisors (see below), whose sum is σ = 2118336000. Its totient is φ = 714938184.

The previous prime is 1251142007. The next prime is 1251142033. The reversal of 1251142011 is 1102411521.

It is not a de Polignac number, because 1251142011 - 2² = 1251142007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1251142091) 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 15 ways as a sum of consecutive naturals, for example, 3309711 + ... + 3310088.

It is an arithmetic number, because the mean of its divisors is an integer number (132396000).

Almost surely, 2^1251142011 is an apocalyptic number.

1251142011 is a deficient number, since it is larger than the sum of its proper divisors (867193989).

1251142011 is an equidigital number, since it uses as much as digits as its factorization.

1251142011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6619815 (or 6619809 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 1251142011 is about 35371.4858466534. The cubic root of 1251142011 is about 1077.5452969116.

Adding to 1251142011 its reverse (1102411521), we get a palindrome (2353553532).

The spelling of 1251142011 in words is "one billion, two hundred fifty-one million, one hundred forty-two thousand, eleven".