81382060031 has 4 divisors (see below), whose sum is σ = 81384630600. Its totient is φ = 81379489464.

The previous prime is 81382059953. The next prime is 81382060049. The reversal of 81382060031 is 13006028318.

It is a happy number.

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 81382060031 - 2¹⁴ = 81382043647 is a prime.

It is a super-2 number, since 2×81382060031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81382060031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81382060091) 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, 1237196 + ... + 1301313.

It is an arithmetic number, because the mean of its divisors is an integer number (20346157650).

Almost surely, 2^81382060031 is an apocalyptic number.

81382060031 is a deficient number, since it is larger than the sum of its proper divisors (2570569).

81382060031 is a wasteful number, since it uses less digits than its factorization.

81382060031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2570568.

The product of its (nonzero) digits is 6912, while the sum is 32.

Adding to 81382060031 its reverse (13006028318), we get a palindrome (94388088349).

The spelling of 81382060031 in words is "eighty-one billion, three hundred eighty-two million, sixty thousand, thirty-one".