747106781 has 2 divisors, whose sum is σ = 747106782. Its totient is φ = 747106780.

The previous prime is 747106739. The next prime is 747106813. The reversal of 747106781 is 187601747.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 591705625 + 155401156 = 24325^2 + 12466^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-747106781 is a prime.

It is a super-2 number, since 2×747106781² = 1116337084432363922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (747106721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 373553390 + 373553391.

It is an arithmetic number, because the mean of its divisors is an integer number (373553391).

Almost surely, 2^747106781 is an apocalyptic number.

It is an amenable number.

747106781 is a deficient number, since it is larger than the sum of its proper divisors (1).

747106781 is an equidigital number, since it uses as much as digits as its factorization.

747106781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65856, while the sum is 41.

The square root of 747106781 is about 27333.2541238690. The cubic root of 747106781 is about 907.3904958345.

The spelling of 747106781 in words is "seven hundred forty-seven million, one hundred six thousand, seven hundred eighty-one".