912911921 has 4 divisors (see below), whose sum is σ = 913817700. Its totient is φ = 912006144.

The previous prime is 912911899. The next prime is 912911933. The reversal of 912911921 is 129119219.

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 329930896 + 582981025 = 18164^2 + 24145^2 .

It is a cyclic number.

It is not a de Polignac number, because 912911921 - 2¹⁴ = 912895537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (912911521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 451376 + ... + 453393.

It is an arithmetic number, because the mean of its divisors is an integer number (228454425).

Almost surely, 2^912911921 is an apocalyptic number.

It is an amenable number.

912911921 is a deficient number, since it is larger than the sum of its proper divisors (905779).

912911921 is a wasteful number, since it uses less digits than its factorization.

912911921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905778.

The product of its digits is 2916, while the sum is 35.

The square root of 912911921 is about 30214.4323296004. The cubic root of 912911921 is about 970.0846353331.

The spelling of 912911921 in words is "nine hundred twelve million, nine hundred eleven thousand, nine hundred twenty-one".