81059213 has 8 divisors (see below), whose sum is σ = 87109632. Its totient is φ = 75151296.

The previous prime is 81059197. The next prime is 81059233. The reversal of 81059213 is 31295018.

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 81059213 - 2⁴ = 81059197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81059233) 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, 34445 + ... + 36722.

It is an arithmetic number, because the mean of its divisors is an integer number (10888704).

Almost surely, 2^81059213 is an apocalyptic number.

It is an amenable number.

81059213 is a deficient number, since it is larger than the sum of its proper divisors (6050419).

81059213 is a wasteful number, since it uses less digits than its factorization.

81059213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71251.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 81059213 is about 9003.2890101340. The cubic root of 81059213 is about 432.7802774162.

The spelling of 81059213 in words is "eighty-one million, fifty-nine thousand, two hundred thirteen".