1961368161 has 16 divisors (see below), whose sum is σ = 2653734720. Its totient is φ = 1288327680.

The previous prime is 1961368153. The next prime is 1961368177. The reversal of 1961368161 is 1618631691.

It is not a de Polignac number, because 1961368161 - 2³ = 1961368153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1961368111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234825 + ... + 243033.

It is an arithmetic number, because the mean of its divisors is an integer number (165858420).

Almost surely, 2^1961368161 is an apocalyptic number.

It is an amenable number.

1961368161 is a deficient number, since it is larger than the sum of its proper divisors (692366559).

1961368161 is a wasteful number, since it uses less digits than its factorization.

1961368161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9376.

The product of its digits is 46656, while the sum is 42.

The square root of 1961368161 is about 44287.3363502480. The cubic root of 1961368161 is about 1251.7560728246.

The spelling of 1961368161 in words is "one billion, nine hundred sixty-one million, three hundred sixty-eight thousand, one hundred sixty-one".