31503055081 has 9 divisors (see below), whose sum is σ = 32936573271. Its totient is φ = 30129452232.

The previous prime is 31503055063. The next prime is 31503055093. The reversal of 31503055081 is 18055030513.

The square root of 31503055081 is 177491.

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

It can be written as a sum of positive squares in only one way, i.e., 15454219225 + 16048835856 = 124315^2 + 126684^2 .

It is not a de Polignac number, because 31503055081 - 2³¹ = 29355571433 is a prime.

It is a super-2 number, since 2×31503055081² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31503055021) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4078435 + ... + 4086151.

Almost surely, 2^31503055081 is an apocalyptic number.

31503055081 is the 177491-st square number.

31503055081 is the 88746-th centered octagonal number.

It is an amenable number.

31503055081 is a deficient number, since it is larger than the sum of its proper divisors (1433518190).

31503055081 is an frugal number, since it uses more digits than its factorization.

31503055081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15480 (or 7740 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 31503055081 its reverse (18055030513), we get a palindrome (49558085594).

The spelling of 31503055081 in words is "thirty-one billion, five hundred three million, fifty-five thousand, eighty-one".