82154909 has 4 divisors (see below), whose sum is σ = 82299360. Its totient is φ = 82010460.

The previous prime is 82154887. The next prime is 82154951. The reversal of 82154909 is 90945128.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82154909 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 (82154959) 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, 71369 + ... + 72510.

It is an arithmetic number, because the mean of its divisors is an integer number (20574840).

Almost surely, 2^82154909 is an apocalyptic number.

It is an amenable number.

82154909 is a deficient number, since it is larger than the sum of its proper divisors (144451).

82154909 is a wasteful number, since it uses less digits than its factorization.

82154909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144450.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 82154909 is about 9063.9345209462. The cubic root of 82154909 is about 434.7215534270.

The spelling of 82154909 in words is "eighty-two million, one hundred fifty-four thousand, nine hundred nine".