1251534335897 has 2 divisors, whose sum is σ = 1251534335898. Its totient is φ = 1251534335896.

The previous prime is 1251534335873. The next prime is 1251534335917. The reversal of 1251534335897 is 7985334351521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1175686972681 + 75847363216 = 1084291^2 + 275404^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251534335897 - 2⁶ = 1251534335833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1251534335827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625767167948 + 625767167949.

It is an arithmetic number, because the mean of its divisors is an integer number (625767167949).

Almost surely, 2^{1251534335897} is an apocalyptic number.

It is an amenable number.

1251534335897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251534335897 is an equidigital number, since it uses as much as digits as its factorization.

1251534335897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608000, while the sum is 56.

The spelling of 1251534335897 in words is "one trillion, two hundred fifty-one billion, five hundred thirty-four million, three hundred thirty-five thousand, eight hundred ninety-seven".