1251532215137 has 2 divisors, whose sum is σ = 1251532215138. Its totient is φ = 1251532215136.

The previous prime is 1251532215103. The next prime is 1251532215161. The reversal of 1251532215137 is 7315122351521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1015249699216 + 236282515921 = 1007596^2 + 486089^2 .

It is an emirp because it is prime and its reverse (7315122351521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1251532215137 - 2¹⁰ = 1251532214113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1251532215137.

It is not a weakly prime, because it can be changed into another prime (1251532215337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625766107568 + 625766107569.

It is an arithmetic number, because the mean of its divisors is an integer number (625766107569).

Almost surely, 2^{1251532215137} is an apocalyptic number.

It is an amenable number.

1251532215137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251532215137 is an equidigital number, since it uses as much as digits as its factorization.

1251532215137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63000, while the sum is 38.

Adding to 1251532215137 its reverse (7315122351521), we get a palindrome (8566654566658).

The spelling of 1251532215137 in words is "one trillion, two hundred fifty-one billion, five hundred thirty-two million, two hundred fifteen thousand, one hundred thirty-seven".