7131971291 has 4 divisors (see below), whose sum is σ = 7551499032. Its totient is φ = 6712443552.

The previous prime is 7131971281. The next prime is 7131971317. The reversal of 7131971291 is 1921791317.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1921791317 = 109 ⋅17631113.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7131971291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7131971281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209763845 + ... + 209763878.

It is an arithmetic number, because the mean of its divisors is an integer number (1887874758).

Almost surely, 2^7131971291 is an apocalyptic number.

7131971291 is a deficient number, since it is larger than the sum of its proper divisors (419527741).

7131971291 is a wasteful number, since it uses less digits than its factorization.

7131971291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419527740.

The product of its digits is 23814, while the sum is 41.

The square root of 7131971291 is about 84450.9993487348. Note that the first 3 decimals coincide. The cubic root of 7131971291 is about 1924.8779405150.

The spelling of 7131971291 in words is "seven billion, one hundred thirty-one million, nine hundred seventy-one thousand, two hundred ninety-one".