1251505202133 has 4 divisors (see below), whose sum is σ = 1668673602848. Its totient is φ = 834336801420.

The previous prime is 1251505202089. The next prime is 1251505202137. The reversal of 1251505202133 is 3312025051521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1251505202133 - 2⁶ = 1251505202069 is a prime.

It is a super-2 number, since 2×1251505202133² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1251505202133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1251505202137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208584200353 + ... + 208584200358.

It is an arithmetic number, because the mean of its divisors is an integer number (417168400712).

Almost surely, 2^{1251505202133} is an apocalyptic number.

It is an amenable number.

1251505202133 is a deficient number, since it is larger than the sum of its proper divisors (417168400715).

1251505202133 is an equidigital number, since it uses as much as digits as its factorization.

1251505202133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417168400714.

The product of its (nonzero) digits is 9000, while the sum is 30.

The spelling of 1251505202133 in words is "one trillion, two hundred fifty-one billion, five hundred five million, two hundred two thousand, one hundred thirty-three".