971132221 has 4 divisors (see below), whose sum is σ = 976947552. Its totient is φ = 965316892.

The previous prime is 971132171. The next prime is 971132263. The reversal of 971132221 is 122231179.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 971132221 - 2⁷ = 971132093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 971132221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971132291) 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, 2907415 + ... + 2907748.

It is an arithmetic number, because the mean of its divisors is an integer number (244236888).

Almost surely, 2^971132221 is an apocalyptic number.

It is an amenable number.

971132221 is a deficient number, since it is larger than the sum of its proper divisors (5815331).

971132221 is a wasteful number, since it uses less digits than its factorization.

971132221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5815330.

The product of its digits is 1512, while the sum is 28.

The square root of 971132221 is about 31162.9944164549. The cubic root of 971132221 is about 990.2832985107.

The spelling of 971132221 in words is "nine hundred seventy-one million, one hundred thirty-two thousand, two hundred twenty-one".