1251516011 has 2 divisors, whose sum is σ = 1251516012. Its totient is φ = 1251516010.

The previous prime is 1251516001. The next prime is 1251516017. The reversal of 1251516011 is 1106151521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1251516011 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251516017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625758005 + 625758006.

It is an arithmetic number, because the mean of its divisors is an integer number (625758006).

Almost surely, 2^1251516011 is an apocalyptic number.

1251516011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251516011 is an equidigital number, since it uses as much as digits as its factorization.

1251516011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 300, while the sum is 23.

The square root of 1251516011 is about 35376.7721958915. The cubic root of 1251516011 is about 1077.6526553058.

Adding to 1251516011 its reverse (1106151521), we get a palindrome (2357667532).

The spelling of 1251516011 in words is "one billion, two hundred fifty-one million, five hundred sixteen thousand, eleven".