81959541 has 8 divisors (see below), whose sum is σ = 109578624. Its totient is φ = 54490080.

The previous prime is 81959513. The next prime is 81959569. The reversal of 81959541 is 14595918.

It is an interprime number because it is at equal distance from previous prime (81959513) and next prime (81959569).

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

It is not a de Polignac number, because 81959541 - 2⁹ = 81959029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81959493 and 81959502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81954541) 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, 36120 + ... + 38321.

It is an arithmetic number, because the mean of its divisors is an integer number (13697328).

Almost surely, 2^81959541 is an apocalyptic number.

It is an amenable number.

81959541 is a deficient number, since it is larger than the sum of its proper divisors (27619083).

81959541 is a wasteful number, since it uses less digits than its factorization.

81959541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74811.

The product of its digits is 64800, while the sum is 42.

The square root of 81959541 is about 9053.1508879506. The cubic root of 81959541 is about 434.3766842300.

The spelling of 81959541 in words is "eighty-one million, nine hundred fifty-nine thousand, five hundred forty-one".