81670601 has 8 divisors (see below), whose sum is σ = 86655744. Its totient is φ = 76705600.

The previous prime is 81670597. The next prime is 81670619. The reversal of 81670601 is 10607618.

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 81670601 - 2² = 81670597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81670801) 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, 3776 + ... + 13326.

It is an arithmetic number, because the mean of its divisors is an integer number (10831968).

Almost surely, 2^81670601 is an apocalyptic number.

It is an amenable number.

81670601 is a deficient number, since it is larger than the sum of its proper divisors (4985143).

81670601 is a wasteful number, since it uses less digits than its factorization.

81670601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10071.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 81670601 is about 9037.1788186358. The cubic root of 81670601 is about 433.8656329778.

It can be divided in two parts, 816 and 70601, that added together give a palindrome (71417).

The spelling of 81670601 in words is "eighty-one million, six hundred seventy thousand, six hundred one".