971639161 has 2 divisors, whose sum is σ = 971639162. Its totient is φ = 971639160.

The previous prime is 971639153. The next prime is 971639167. The reversal of 971639161 is 161936179.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 662547600 + 309091561 = 25740^2 + 17581^2 .

It is a cyclic number.

It is not a de Polignac number, because 971639161 - 2³ = 971639153 is a prime.

It is not a weakly prime, because it can be changed into another prime (971639167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485819580 + 485819581.

It is an arithmetic number, because the mean of its divisors is an integer number (485819581).

Almost surely, 2^971639161 is an apocalyptic number.

It is an amenable number.

971639161 is a deficient number, since it is larger than the sum of its proper divisors (1).

971639161 is an equidigital number, since it uses as much as digits as its factorization.

971639161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61236, while the sum is 43.

The square root of 971639161 is about 31171.1270409012. The cubic root of 971639161 is about 990.4555808830.

The spelling of 971639161 in words is "nine hundred seventy-one million, six hundred thirty-nine thousand, one hundred sixty-one".