1253025507781 has 2 divisors, whose sum is σ = 1253025507782. Its totient is φ = 1253025507780.

The previous prime is 1253025507763. The next prime is 1253025507823. The reversal of 1253025507781 is 1877055203521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1240316553025 + 12708954756 = 1113695^2 + 112734^2 .

It is an emirp because it is prime and its reverse (1877055203521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1253025507781 - 2⁹ = 1253025507269 is a prime.

It is a super-2 number, since 2×1253025507781² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1253025507761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626512753890 + 626512753891.

It is an arithmetic number, because the mean of its divisors is an integer number (626512753891).

Almost surely, 2^{1253025507781} is an apocalyptic number.

It is an amenable number.

1253025507781 is a deficient number, since it is larger than the sum of its proper divisors (1).

1253025507781 is an equidigital number, since it uses as much as digits as its factorization.

1253025507781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 588000, while the sum is 46.

The spelling of 1253025507781 in words is "one trillion, two hundred fifty-three billion, twenty-five million, five hundred seven thousand, seven hundred eighty-one".