1251423105061 has 2 divisors, whose sum is σ = 1251423105062. Its totient is φ = 1251423105060.

The previous prime is 1251423105011. The next prime is 1251423105109. The reversal of 1251423105061 is 1605013241521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 841815425025 + 409607680036 = 917505^2 + 640006^2 .

It is an emirp because it is prime and its reverse (1605013241521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1251423105061 - 2⁷ = 1251423104933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251423105011) 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 as a sum of consecutive naturals, namely, 625711552530 + 625711552531.

It is an arithmetic number, because the mean of its divisors is an integer number (625711552531).

Almost surely, 2^{1251423105061} is an apocalyptic number.

It is an amenable number.

1251423105061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251423105061 is an equidigital number, since it uses as much as digits as its factorization.

1251423105061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 1251423105061 its reverse (1605013241521), we get a palindrome (2856436346582).

The spelling of 1251423105061 in words is "one trillion, two hundred fifty-one billion, four hundred twenty-three million, one hundred five thousand, sixty-one".