81607541 has 8 divisors (see below), whose sum is σ = 83267904. Its totient is φ = 79960320.

The previous prime is 81607517. The next prime is 81607549. The reversal of 81607541 is 14570618.

It is a happy number.

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 81607541 - 2¹⁴ = 81591157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81607498 and 81607507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81607549) 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 7 ways as a sum of consecutive naturals, for example, 9776 + ... + 16086.

It is an arithmetic number, because the mean of its divisors is an integer number (10408488).

Almost surely, 2^81607541 is an apocalyptic number.

It is an amenable number.

81607541 is a deficient number, since it is larger than the sum of its proper divisors (1660363).

81607541 is a wasteful number, since it uses less digits than its factorization.

81607541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6571.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 81607541 is about 9033.6892242317. The cubic root of 81607541 is about 433.7539379036.

The spelling of 81607541 in words is "eighty-one million, six hundred seven thousand, five hundred forty-one".