921618052 has 12 divisors (see below), whose sum is σ = 1656421900. Its totient is φ = 448354656.

The previous prime is 921618041. The next prime is 921618053. The reversal of 921618052 is 250816129.

It can be written as a sum of positive squares in 2 ways, for example, as 881852416 + 39765636 = 29696^2 + 6306^2 .

It is a junction number, because it is equal to n+sod(n) for n = 921617999 and 921618017.

It is not an unprimeable number, because it can be changed into a prime (921618053) 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, 3113427 + ... + 3113722.

Almost surely, 2^921618052 is an apocalyptic number.

It is an amenable number.

921618052 is a deficient number, since it is larger than the sum of its proper divisors (734803848).

921618052 is a wasteful number, since it uses less digits than its factorization.

921618052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6227190 (or 6227188 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 921618052 is about 30358.1628561413. The cubic root of 921618052 is about 973.1586731803.

The spelling of 921618052 in words is "nine hundred twenty-one million, six hundred eighteen thousand, fifty-two".