51051000781 has 16 divisors (see below), whose sum is σ = 55982887488. Its totient is φ = 46167811200.

The previous prime is 51051000761. The next prime is 51051000797. The reversal of 51051000781 is 18700015015.

It is a cyclic number.

It is not a de Polignac number, because 51051000781 - 2¹³ = 51050992589 is a prime.

It is a super-2 number, since 2×51051000781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51051000751) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6580801 + ... + 6588553.

It is an arithmetic number, because the mean of its divisors is an integer number (3498930468).

Almost surely, 2^51051000781 is an apocalyptic number.

It is an amenable number.

51051000781 is a deficient number, since it is larger than the sum of its proper divisors (4931886707).

51051000781 is a wasteful number, since it uses less digits than its factorization.

51051000781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10812.

The product of its (nonzero) digits is 1400, while the sum is 28.

Adding to 51051000781 its reverse (18700015015), we get a palindrome (69751015796).

The spelling of 51051000781 in words is "fifty-one billion, fifty-one million, seven hundred eighty-one", and thus it is an aban number.