8126951781 has 16 divisors (see below), whose sum is σ = 11753430080. Its totient is φ = 4965217920.

The previous prime is 8126951773. The next prime is 8126951801. The reversal of 8126951781 is 1871596218.

It is a happy number.

It is not a de Polignac number, because 8126951781 - 2³ = 8126951773 is a prime.

It is a super-2 number, since 2×8126951781² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8126951781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8126951761) 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, 744160 + ... + 755001.

It is an arithmetic number, because the mean of its divisors is an integer number (734589380).

Almost surely, 2^8126951781 is an apocalyptic number.

It is an amenable number.

8126951781 is a deficient number, since it is larger than the sum of its proper divisors (3626478299).

8126951781 is a wasteful number, since it uses less digits than its factorization.

8126951781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1499316.

The product of its digits is 241920, while the sum is 48.

The square root of 8126951781 is about 90149.6077695294. The cubic root of 8126951781 is about 2010.5238423273.

The spelling of 8126951781 in words is "eight billion, one hundred twenty-six million, nine hundred fifty-one thousand, seven hundred eighty-one".