1251378813847 has 2 divisors, whose sum is σ = 1251378813848. Its totient is φ = 1251378813846.

The previous prime is 1251378813793. The next prime is 1251378813931. The reversal of 1251378813847 is 7483188731521.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1251378813847 - 2¹¹ = 1251378811799 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1251378813791 and 1251378813800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1251378213847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625689406923 + 625689406924.

It is an arithmetic number, because the mean of its divisors is an integer number (625689406924).

Almost surely, 2^{1251378813847} is an apocalyptic number.

1251378813847 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251378813847 is an equidigital number, since it uses as much as digits as its factorization.

1251378813847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9031680, while the sum is 58.

The spelling of 1251378813847 in words is "one trillion, two hundred fifty-one billion, three hundred seventy-eight million, eight hundred thirteen thousand, eight hundred forty-seven".