7121571137 has 16 divisors (see below), whose sum is σ = 7404859728. Its totient is φ = 6843755520.

The previous prime is 7121571113. The next prime is 7121571143. The reversal of 7121571137 is 7311751217.

It can be written as a sum of positive squares in 8 ways, for example, as 27888961 + 7093682176 = 5281^2 + 84224^2 .

It is a cyclic number.

It is not a de Polignac number, because 7121571137 - 2⁸ = 7121570881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7121571097 and 7121571106.

It is not an unprimeable number, because it can be changed into a prime (7121501137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4108523 + ... + 4110255.

It is an arithmetic number, because the mean of its divisors is an integer number (462803733).

Almost surely, 2^7121571137 is an apocalyptic number.

It is an amenable number.

7121571137 is a deficient number, since it is larger than the sum of its proper divisors (283288591).

7121571137 is a wasteful number, since it uses less digits than its factorization.

7121571137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3220.

The product of its digits is 10290, while the sum is 35.

The square root of 7121571137 is about 84389.4018049660. The cubic root of 7121571137 is about 1923.9418381406.

The spelling of 7121571137 in words is "seven billion, one hundred twenty-one million, five hundred seventy-one thousand, one hundred thirty-seven".