81541724951 has 8 divisors (see below), whose sum is σ = 84919644000. Its totient is φ = 78201548320.

The previous prime is 81541724921. The next prime is 81541724981. The reversal of 81541724951 is 15942714518.

It is an interprime number because it is at equal distance from previous prime (81541724921) and next prime (81541724981).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81541724951 - 2¹⁰ = 81541723927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81541724896 and 81541724905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81541724921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9431195 + ... + 9439836.

It is an arithmetic number, because the mean of its divisors is an integer number (10614955500).

Almost surely, 2^81541724951 is an apocalyptic number.

81541724951 is a deficient number, since it is larger than the sum of its proper divisors (3377919049).

81541724951 is a wasteful number, since it uses less digits than its factorization.

81541724951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18871209.

The product of its digits is 403200, while the sum is 47.

The spelling of 81541724951 in words is "eighty-one billion, five hundred forty-one million, seven hundred twenty-four thousand, nine hundred fifty-one".