921669707 has 4 divisors (see below), whose sum is σ = 1053336816. Its totient is φ = 790002600.

The previous prime is 921669643. The next prime is 921669719. The reversal of 921669707 is 707966129.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 707966129 = 13 ⋅54458933.

It is a cyclic number.

It is not a de Polignac number, because 921669707 - 2⁶ = 921669643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (921669737) 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, 65833544 + ... + 65833557.

It is an arithmetic number, because the mean of its divisors is an integer number (263334204).

Almost surely, 2^921669707 is an apocalyptic number.

921669707 is a deficient number, since it is larger than the sum of its proper divisors (131667109).

921669707 is a wasteful number, since it uses less digits than its factorization.

921669707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131667108.

The product of its (nonzero) digits is 285768, while the sum is 47.

The square root of 921669707 is about 30359.0136038706. The cubic root of 921669707 is about 973.1768540930.

The spelling of 921669707 in words is "nine hundred twenty-one million, six hundred sixty-nine thousand, seven hundred seven".