81667041 has 4 divisors (see below), whose sum is σ = 108889392. Its totient is φ = 54444692.

The previous prime is 81667007. The next prime is 81667067. The reversal of 81667041 is 14076618.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81667041 - 2¹⁰ = 81666017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81666993 and 81667011.

It is not an unprimeable number, because it can be changed into a prime (81667141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13611171 + ... + 13611176.

It is an arithmetic number, because the mean of its divisors is an integer number (27222348).

Almost surely, 2^81667041 is an apocalyptic number.

It is an amenable number.

81667041 is a deficient number, since it is larger than the sum of its proper divisors (27222351).

81667041 is a wasteful number, since it uses less digits than its factorization.

81667041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27222350.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 81667041 is about 9036.9818523664. The cubic root of 81667041 is about 433.8593288566.

The spelling of 81667041 in words is "eighty-one million, six hundred sixty-seven thousand, forty-one".