81207193 has 8 divisors (see below), whose sum is σ = 83636480. Its totient is φ = 78790320.

The previous prime is 81207179. The next prime is 81207223. The reversal of 81207193 is 39170218.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81207193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81205193) 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, 11128 + ... + 16918.

It is an arithmetic number, because the mean of its divisors is an integer number (10454560).

Almost surely, 2^81207193 is an apocalyptic number.

It is an amenable number.

81207193 is a deficient number, since it is larger than the sum of its proper divisors (2429287).

81207193 is a wasteful number, since it uses less digits than its factorization.

81207193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6207.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 81207193 is about 9011.5033706924. The cubic root of 81207193 is about 433.0434755188.

The spelling of 81207193 in words is "eighty-one million, two hundred seven thousand, one hundred ninety-three".