971667811 has 4 divisors (see below), whose sum is σ = 972428800. Its totient is φ = 970906824.

The previous prime is 971667799. The next prime is 971667869. The reversal of 971667811 is 118766179.

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

It is a cyclic number.

It is not a de Polignac number, because 971667811 - 2⁵ = 971667779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (971661811) 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, 378576 + ... + 381133.

It is an arithmetic number, because the mean of its divisors is an integer number (243107200).

Almost surely, 2^971667811 is an apocalyptic number.

971667811 is a deficient number, since it is larger than the sum of its proper divisors (760989).

971667811 is a wasteful number, since it uses less digits than its factorization.

971667811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760988.

The product of its digits is 127008, while the sum is 46.

The square root of 971667811 is about 31171.5865974127. The cubic root of 971667811 is about 990.4653157292.

The spelling of 971667811 in words is "nine hundred seventy-one million, six hundred sixty-seven thousand, eight hundred eleven".