5071251307781 has 8 divisors (see below), whose sum is σ = 5140764920280. Its totient is φ = 5001738895872.

The previous prime is 5071251307757. The next prime is 5071251307789. The reversal of 5071251307781 is 1877031521705.

It can be written as a sum of positive squares in 4 ways, for example, as 720731383681 + 4350519924100 = 848959^2 + 2085790^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5071251307781 is a prime.

It is a super-2 number, since 2×5071251307781² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5071251307789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11209475 + ... + 11653103.

It is an arithmetic number, because the mean of its divisors is an integer number (642595615035).

Almost surely, 2^{5071251307781} is an apocalyptic number.

It is an amenable number.

5071251307781 is a deficient number, since it is larger than the sum of its proper divisors (69513612499).

5071251307781 is a wasteful number, since it uses less digits than its factorization.

5071251307781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600295.

The product of its (nonzero) digits is 411600, while the sum is 47.

The spelling of 5071251307781 in words is "five trillion, seventy-one billion, two hundred fifty-one million, three hundred seven thousand, seven hundred eighty-one".