82121161491 has 12 divisors (see below), whose sum is σ = 118623582168. Its totient is φ = 54745536384.

The previous prime is 82121161477. The next prime is 82121161531. The reversal of 82121161491 is 19416112128.

82121161491 is a `hidden beast` number, since 8 + 2 + 1 + 2 + 1 + 161 + 491 = 666.

It is not a de Polignac number, because 82121161491 - 2⁶ = 82121161427 is a prime.

It is not an unprimeable number, because it can be changed into a prime (82121161091) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144931 + ... + 430403.

It is an arithmetic number, because the mean of its divisors is an integer number (9885298514).

Almost surely, 2^82121161491 is an apocalyptic number.

82121161491 is a deficient number, since it is larger than the sum of its proper divisors (36502420677).

82121161491 is a wasteful number, since it uses less digits than its factorization.

82121161491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317442 (or 317439 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The spelling of 82121161491 in words is "eighty-two billion, one hundred twenty-one million, one hundred sixty-one thousand, four hundred ninety-one".