81255958 has 16 divisors (see below), whose sum is σ = 140234400. Its totient is φ = 34589376.

The previous prime is 81255953. The next prime is 81255961. The reversal of 81255958 is 85955218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81255953) 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, 17391 + ... + 21562.

It is an arithmetic number, because the mean of its divisors is an integer number (8764650).

Almost surely, 2^81255958 is an apocalyptic number.

81255958 is a deficient number, since it is larger than the sum of its proper divisors (58978442).

81255958 is a wasteful number, since it uses less digits than its factorization.

81255958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39111.

The product of its digits is 144000, while the sum is 43.

The square root of 81255958 is about 9014.2086729785. The cubic root of 81255958 is about 433.1301391862.

The spelling of 81255958 in words is "eighty-one million, two hundred fifty-five thousand, nine hundred fifty-eight".