921971266 has 4 divisors (see below), whose sum is σ = 1382956902. Its totient is φ = 460985632.

The previous prime is 921971249. The next prime is 921971269. The reversal of 921971266 is 662179129.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 919363041 + 2608225 = 30321^2 + 1615^2 .

It is not an unprimeable number, because it can be changed into a prime (921971269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 230492815 + ... + 230492818.

Almost surely, 2^921971266 is an apocalyptic number.

921971266 is a deficient number, since it is larger than the sum of its proper divisors (460985636).

921971266 is a wasteful number, since it uses less digits than its factorization.

921971266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460985635.

The product of its digits is 81648, while the sum is 43.

The square root of 921971266 is about 30363.9797457448. The cubic root of 921971266 is about 973.2829796880.

The spelling of 921971266 in words is "nine hundred twenty-one million, nine hundred seventy-one thousand, two hundred sixty-six".