8956129921 has 4 divisors (see below), whose sum is σ = 9427505200. Its totient is φ = 8484754644.

The previous prime is 8956129909. The next prime is 8956129937. The reversal of 8956129921 is 1299216598.

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 not a de Polignac number, because 8956129921 - 2¹⁵ = 8956097153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8956129951) 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, 235687611 + ... + 235687648.

It is an arithmetic number, because the mean of its divisors is an integer number (2356876300).

Almost surely, 2^8956129921 is an apocalyptic number.

It is an amenable number.

8956129921 is a deficient number, since it is larger than the sum of its proper divisors (471375279).

8956129921 is a wasteful number, since it uses less digits than its factorization.

8956129921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471375278.

The product of its digits is 699840, while the sum is 52.

The square root of 8956129921 is about 94636.8317358522. The cubic root of 8956129921 is about 2076.6985595451.

The spelling of 8956129921 in words is "eight billion, nine hundred fifty-six million, one hundred twenty-nine thousand, nine hundred twenty-one".