971661311 has 4 divisors (see below), whose sum is σ = 1022801400. Its totient is φ = 920521224.

The previous prime is 971661287. The next prime is 971661323. The reversal of 971661311 is 113166179.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113166179 = 7 ⋅16166597.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-971661311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971661391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25570016 + ... + 25570053.

It is an arithmetic number, because the mean of its divisors is an integer number (255700350).

Almost surely, 2^971661311 is an apocalyptic number.

971661311 is a deficient number, since it is larger than the sum of its proper divisors (51140089).

971661311 is a wasteful number, since it uses less digits than its factorization.

971661311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51140088.

The product of its digits is 6804, while the sum is 35.

The square root of 971661311 is about 31171.4823356221. The cubic root of 971661311 is about 990.4631071421.

The spelling of 971661311 in words is "nine hundred seventy-one million, six hundred sixty-one thousand, three hundred eleven".