71130490209 has 27 divisors (see below), whose sum is σ = 108459412113. Its totient is φ = 44914918824.

The previous prime is 71130490201. The next prime is 71130490273. The reversal of 71130490209 is 90209403117.

The square root of 71130490209 is 266703.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 71130490209 - 2³ = 71130490201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71130490201) 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 26 ways as a sum of consecutive naturals, for example, 15199732 + ... + 15204410.

Almost surely, 2^71130490209 is an apocalyptic number.

71130490209 is the 266703-rd square number.

71130490209 is the 133352-nd centered octagonal number.

It is an amenable number.

71130490209 is a deficient number, since it is larger than the sum of its proper divisors (37328921904).

71130490209 is an frugal number, since it uses more digits than its factorization.

71130490209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9402 (or 4701 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

Multiplying 71130490209 by its sum of digits (36), we get a square (2560697647524 = 1600218²).

The spelling of 71130490209 in words is "seventy-one billion, one hundred thirty million, four hundred ninety thousand, two hundred nine".