5177647781 has 2 divisors, whose sum is σ = 5177647782. Its totient is φ = 5177647780.

The previous prime is 5177647757. The next prime is 5177647841. The reversal of 5177647781 is 1877467715.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3137680225 + 2039967556 = 56015^2 + 45166^2 .

It is a cyclic number.

It is not a de Polignac number, because 5177647781 - 2²² = 5173453477 is a prime.

It is a super-2 number, since 2×5177647781² = 53616073088188447922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5177640781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2588823890 + 2588823891.

It is an arithmetic number, because the mean of its divisors is an integer number (2588823891).

Almost surely, 2^5177647781 is an apocalyptic number.

It is an amenable number.

5177647781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5177647781 is an equidigital number, since it uses as much as digits as its factorization.

5177647781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304960, while the sum is 53.

The square root of 5177647781 is about 71955.8738464067. The cubic root of 5177647781 is about 1729.9922907204.

The spelling of 5177647781 in words is "five billion, one hundred seventy-seven million, six hundred forty-seven thousand, seven hundred eighty-one".