961806169 has 3 divisors (see below), whose sum is σ = 961837183. Its totient is φ = 961775156.

The previous prime is 961806137. The next prime is 961806187. The reversal of 961806169 is 961608169.

The square root of 961806169 is 31013.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1550025 + 960256144 = 1245^2 + 30988^2 .

It is not a de Polignac number, because 961806169 - 2⁵ = 961806137 is a prime.

It is a super-2 number, since 2×961806169² = 1850142213452913122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (961806869) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 15507 + ... + 46519.

Almost surely, 2^961806169 is an apocalyptic number.

961806169 is the 31013-rd square number.

961806169 is the 15507-th centered octagonal number.

It is an amenable number.

961806169 is a deficient number, since it is larger than the sum of its proper divisors (31014).

961806169 is an frugal number, since it uses more digits than its factorization.

961806169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62026 (or 31013 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The cubic root of 961806169 is about 987.1031082285.

The spelling of 961806169 in words is "nine hundred sixty-one million, eight hundred six thousand, one hundred sixty-nine".