1251505052111 has 2 divisors, whose sum is σ = 1251505052112. Its totient is φ = 1251505052110.

The previous prime is 1251505052087. The next prime is 1251505052117. The reversal of 1251505052111 is 1112505051521.

It is a strong prime.

It is an emirp because it is prime and its reverse (1112505051521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1251505052111 - 2⁶ = 1251505052047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251505052117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625752526055 + 625752526056.

It is an arithmetic number, because the mean of its divisors is an integer number (625752526056).

Almost surely, 2^{1251505052111} is an apocalyptic number.

1251505052111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251505052111 is an equidigital number, since it uses as much as digits as its factorization.

1251505052111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2500, while the sum is 29.

The spelling of 1251505052111 in words is "one trillion, two hundred fifty-one billion, five hundred five million, fifty-two thousand, one hundred eleven".