81458291 has 8 divisors (see below), whose sum is σ = 83978160. Its totient is φ = 78976512.

The previous prime is 81458287. The next prime is 81458329. The reversal of 81458291 is 19285418.

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 81458291 - 2² = 81458287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81458281) 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, 5150 + ... + 13763.

It is an arithmetic number, because the mean of its divisors is an integer number (10497270).

Almost surely, 2^81458291 is an apocalyptic number.

81458291 is a deficient number, since it is larger than the sum of its proper divisors (2519869).

81458291 is a wasteful number, since it uses less digits than its factorization.

81458291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19045.

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

The square root of 81458291 is about 9025.4246991485. The cubic root of 81458291 is about 433.4893492787.

The spelling of 81458291 in words is "eighty-one million, four hundred fifty-eight thousand, two hundred ninety-one".