91176284921 has 4 divisors (see below), whose sum is σ = 91177414644. Its totient is φ = 91175155200.

The previous prime is 91176284887. The next prime is 91176284963. The reversal of 91176284921 is 12948267119.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 55203852025 + 35972432896 = 234955^2 + 189664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91176284921 is a prime.

It is a super-2 number, since 2×91176284921² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91176284921.

It is not an unprimeable number, because it can be changed into a prime (91176284971) 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, 433640 + ... + 608601.

It is an arithmetic number, because the mean of its divisors is an integer number (22794353661).

Almost surely, 2^91176284921 is an apocalyptic number.

It is an amenable number.

91176284921 is a deficient number, since it is larger than the sum of its proper divisors (1129723).

91176284921 is a wasteful number, since it uses less digits than its factorization.

91176284921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1129722.

The product of its digits is 435456, while the sum is 50.

The spelling of 91176284921 in words is "ninety-one billion, one hundred seventy-six million, two hundred eighty-four thousand, nine hundred twenty-one".