712172781 has 12 divisors (see below), whose sum is σ = 1056497052. Its totient is φ = 461949696.

The previous prime is 712172779. The next prime is 712172803. The reversal of 712172781 is 187271217.

It can be written as a sum of positive squares in 2 ways, for example, as 318943881 + 393228900 = 17859^2 + 19830^2 .

It is not a de Polignac number, because 712172781 - 2¹ = 712172779 is a prime.

It is a super-2 number, since 2×712172781² = 1014380139994547922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (712172701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1068996 + ... + 1069661.

It is an arithmetic number, because the mean of its divisors is an integer number (88041421).

Almost surely, 2^712172781 is an apocalyptic number.

It is an amenable number.

712172781 is a deficient number, since it is larger than the sum of its proper divisors (344324271).

712172781 is a wasteful number, since it uses less digits than its factorization.

712172781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2138700 (or 2138697 counting only the distinct ones).

The product of its digits is 10976, while the sum is 36.

The square root of 712172781 is about 26686.5655527271. The cubic root of 712172781 is about 893.0212439044.

The spelling of 712172781 in words is "seven hundred twelve million, one hundred seventy-two thousand, seven hundred eighty-one".