81258705031 has 48 divisors (see below), whose sum is σ = 101437090560. Its totient is φ = 64709124480.

The previous prime is 81258705007. The next prime is 81258705041. The reversal of 81258705031 is 13050785218.

It is not a de Polignac number, because 81258705031 - 2¹³ = 81258696839 is a prime.

It is a super-2 number, since 2×81258705031² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81258705001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14531046 + ... + 14536636.

It is an arithmetic number, because the mean of its divisors is an integer number (2113272720).

Almost surely, 2^81258705031 is an apocalyptic number.

81258705031 is a deficient number, since it is larger than the sum of its proper divisors (20178385529).

81258705031 is a wasteful number, since it uses less digits than its factorization.

81258705031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5924 (or 5917 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 40.

The spelling of 81258705031 in words is "eighty-one billion, two hundred fifty-eight million, seven hundred five thousand, thirty-one".