1251389011 has 2 divisors, whose sum is σ = 1251389012. Its totient is φ = 1251389010.

The previous prime is 1251388973. The next prime is 1251389017. The reversal of 1251389011 is 1109831521.

It is a strong prime.

It is an emirp because it is prime and its reverse (1109831521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1251389011 - 2¹¹ = 1251386963 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251389017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625694505 + 625694506.

It is an arithmetic number, because the mean of its divisors is an integer number (625694506).

Almost surely, 2^1251389011 is an apocalyptic number.

1251389011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251389011 is an equidigital number, since it uses as much as digits as its factorization.

1251389011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 31.

The square root of 1251389011 is about 35374.9771872718. The cubic root of 1251389011 is about 1077.6162017791.

The spelling of 1251389011 in words is "one billion, two hundred fifty-one million, three hundred eighty-nine thousand, eleven".