31156033534081 has 3 divisors (see below), whose sum is σ = 31156039115841. Its totient is φ = 31156027952322.

The previous prime is 31156033534069. The next prime is 31156033534091. The reversal of 31156033534081 is 18043533065113.

The square root of 31156033534081 is 5581759.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 31156033534081 - 2¹⁹ = 31156033009793 is a prime.

It is a super-2 number, since 2×31156033534081² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31156033534091) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2790880 + ... + 8372638.

It is an arithmetic number, because the mean of its divisors is an integer number (10385346371947).

Almost surely, 2^{31156033534081} is an apocalyptic number.

31156033534081 is the 5581759-th square number.

31156033534081 is the 2790880-th centered octagonal number.

It is an amenable number.

31156033534081 is a deficient number, since it is larger than the sum of its proper divisors (5581760).

31156033534081 is an frugal number, since it uses more digits than its factorization.

31156033534081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11163518 (or 5581759 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 43.

Adding to 31156033534081 its reverse (18043533065113), we get a palindrome (49199566599194).

The spelling of 31156033534081 in words is "thirty-one trillion, one hundred fifty-six billion, thirty-three million, five hundred thirty-four thousand, eighty-one".