912253921 has 4 divisors (see below), whose sum is σ = 912324292. Its totient is φ = 912183552.

The previous prime is 912253891. The next prime is 912253931. The reversal of 912253921 is 129352219.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 129352219 = 6883 ⋅18793.

It can be written as a sum of positive squares in 2 ways, for example, as 14592400 + 897661521 = 3820^2 + 29961^2 .

It is a cyclic number.

It is not a de Polignac number, because 912253921 - 2¹³ = 912245729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (912253931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9480 + ... + 43753.

It is an arithmetic number, because the mean of its divisors is an integer number (228081073).

Almost surely, 2^912253921 is an apocalyptic number.

It is an amenable number.

912253921 is a deficient number, since it is larger than the sum of its proper divisors (70371).

912253921 is a wasteful number, since it uses less digits than its factorization.

912253921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70370.

The product of its digits is 9720, while the sum is 34.

The square root of 912253921 is about 30203.5415307543. The cubic root of 912253921 is about 969.8515098451.

The spelling of 912253921 in words is "nine hundred twelve million, two hundred fifty-three thousand, nine hundred twenty-one".