1251501881503 has 2 divisors, whose sum is σ = 1251501881504. Its totient is φ = 1251501881502.

The previous prime is 1251501881489. The next prime is 1251501881557. The reversal of 1251501881503 is 3051881051521.

It is a weak prime.

It is an emirp because it is prime and its reverse (3051881051521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1251501881503 - 2²⁵ = 1251468327071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251501882503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625750940751 + 625750940752.

It is an arithmetic number, because the mean of its divisors is an integer number (625750940752).

Almost surely, 2^{1251501881503} is an apocalyptic number.

1251501881503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251501881503 is an equidigital number, since it uses as much as digits as its factorization.

1251501881503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48000, while the sum is 40.

The spelling of 1251501881503 in words is "one trillion, two hundred fifty-one billion, five hundred one million, eight hundred eighty-one thousand, five hundred three".