81258741 has 16 divisors (see below), whose sum is σ = 120627520. Its totient is φ = 54062640.

The previous prime is 81258733. The next prime is 81258767. The reversal of 81258741 is 14785218.

It is not a de Polignac number, because 81258741 - 2³ = 81258733 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81258696 and 81258705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81258721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11826 + ... + 17388.

It is an arithmetic number, because the mean of its divisors is an integer number (7539220).

Almost surely, 2^81258741 is an apocalyptic number.

It is an amenable number.

81258741 is a deficient number, since it is larger than the sum of its proper divisors (39368779).

81258741 is a wasteful number, since it uses less digits than its factorization.

81258741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6113 (or 6107 counting only the distinct ones).

The product of its digits is 17920, while the sum is 36.

The square root of 81258741 is about 9014.3630390616. The cubic root of 81258741 is about 433.1350840028.

The spelling of 81258741 in words is "eighty-one million, two hundred fifty-eight thousand, seven hundred forty-one".