81958214 has 8 divisors (see below), whose sum is σ = 132394080. Its totient is φ = 37826856.

The previous prime is 81958213. The next prime is 81958237. The reversal of 81958214 is 41285918.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81958213) 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, 1576094 + ... + 1576145.

It is an arithmetic number, because the mean of its divisors is an integer number (16549260).

Almost surely, 2^81958214 is an apocalyptic number.

81958214 is a deficient number, since it is larger than the sum of its proper divisors (50435866).

81958214 is a wasteful number, since it uses less digits than its factorization.

81958214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152254.

The product of its digits is 23040, while the sum is 38.

The square root of 81958214 is about 9053.0775982535. The cubic root of 81958214 is about 434.3743398986.

The spelling of 81958214 in words is "eighty-one million, nine hundred fifty-eight thousand, two hundred fourteen".