1251533520151 has 2 divisors, whose sum is σ = 1251533520152. Its totient is φ = 1251533520150.

The previous prime is 1251533520119. The next prime is 1251533520239. The reversal of 1251533520151 is 1510253351521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251533520151 - 2⁵ = 1251533520119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251533527151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625766760075 + 625766760076.

It is an arithmetic number, because the mean of its divisors is an integer number (625766760076).

Almost surely, 2^{1251533520151} is an apocalyptic number.

1251533520151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251533520151 is an equidigital number, since it uses as much as digits as its factorization.

1251533520151 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22500, while the sum is 34.

Adding to 1251533520151 its reverse (1510253351521), we get a palindrome (2761786871672).

The spelling of 1251533520151 in words is "one trillion, two hundred fifty-one billion, five hundred thirty-three million, five hundred twenty thousand, one hundred fifty-one".