81032272631 has 4 divisors (see below), whose sum is σ = 81035988432. Its totient is φ = 81028556832.

The previous prime is 81032272621. The next prime is 81032272661. The reversal of 81032272631 is 13627223018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81032272631 - 2⁶ = 81032272567 is a prime.

It is a super-2 number, since 2×81032272631² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81032272591 and 81032272600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81032272621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1824995 + ... + 1868868.

It is an arithmetic number, because the mean of its divisors is an integer number (20258997108).

Almost surely, 2^81032272631 is an apocalyptic number.

81032272631 is a deficient number, since it is larger than the sum of its proper divisors (3715801).

81032272631 is a wasteful number, since it uses less digits than its factorization.

81032272631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3715800.

The product of its (nonzero) digits is 24192, while the sum is 35.

Adding to 81032272631 its reverse (13627223018), we get a palindrome (94659495649).

The spelling of 81032272631 in words is "eighty-one billion, thirty-two million, two hundred seventy-two thousand, six hundred thirty-one".