82991455 has 4 divisors (see below), whose sum is σ = 99589752. Its totient is φ = 66393160.

The previous prime is 82991453. The next prime is 82991459. The reversal of 82991455 is 55419928.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 82991455 - 2¹ = 82991453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82991453) 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, 8299141 + ... + 8299150.

It is an arithmetic number, because the mean of its divisors is an integer number (24897438).

Almost surely, 2^82991455 is an apocalyptic number.

82991455 is a deficient number, since it is larger than the sum of its proper divisors (16598297).

82991455 is a wasteful number, since it uses less digits than its factorization.

82991455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16598296.

The product of its digits is 129600, while the sum is 43.

The square root of 82991455 is about 9109.9645992726. The cubic root of 82991455 is about 436.1920971964.

The spelling of 82991455 in words is "eighty-two million, nine hundred ninety-one thousand, four hundred fifty-five".