5126731781 has 16 divisors (see below), whose sum is σ = 5290233600. Its totient is φ = 4966049088.

The previous prime is 5126731747. The next prime is 5126731783. The reversal of 5126731781 is 1871376215.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5126731781 is a prime.

It is a super-2 number, since 2×5126731781² = 52566757508630863922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5126731783) 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, 3527651 + ... + 3529103.

It is an arithmetic number, because the mean of its divisors is an integer number (330639600).

Almost surely, 2^5126731781 is an apocalyptic number.

It is an amenable number.

5126731781 is a deficient number, since it is larger than the sum of its proper divisors (163501819).

5126731781 is a wasteful number, since it uses less digits than its factorization.

5126731781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2348.

The product of its digits is 70560, while the sum is 41.

The square root of 5126731781 is about 71601.1995779400. The cubic root of 5126731781 is about 1724.3027953008.

The spelling of 5126731781 in words is "five billion, one hundred twenty-six million, seven hundred thirty-one thousand, seven hundred eighty-one".