5126149781 has 2 divisors, whose sum is σ = 5126149782. Its totient is φ = 5126149780.

The previous prime is 5126149753. The next prime is 5126149829. The reversal of 5126149781 is 1879416215.

5126149781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3935554756 + 1190595025 = 62734^2 + 34505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5126149781 is a prime.

It is a super-2 number, since 2×5126149781² = 52554823154492695922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5126149711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2563074890 + 2563074891.

It is an arithmetic number, because the mean of its divisors is an integer number (2563074891).

Almost surely, 2^5126149781 is an apocalyptic number.

It is an amenable number.

5126149781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5126149781 is an equidigital number, since it uses as much as digits as its factorization.

5126149781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 44.

The square root of 5126149781 is about 71597.1352848702. The cubic root of 5126149781 is about 1724.2375437105.

The spelling of 5126149781 in words is "five billion, one hundred twenty-six million, one hundred forty-nine thousand, seven hundred eighty-one".