1169155961 has 4 divisors (see below), whose sum is σ = 1169483172. Its totient is φ = 1168828752.

The previous prime is 1169155957. The next prime is 1169156003. The reversal of 1169155961 is 1695519611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1695519611 = 31 ⋅54694181.

It can be written as a sum of positive squares in 2 ways, for example, as 125865961 + 1043290000 = 11219^2 + 32300^2 .

It is a cyclic number.

It is not a de Polignac number, because 1169155961 - 2² = 1169155957 is a prime.

It is a super-2 number, since 2×1169155961² = 2733851322283667042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1169155061) 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, 158186 + ... + 165411.

It is an arithmetic number, because the mean of its divisors is an integer number (292370793).

Almost surely, 2^1169155961 is an apocalyptic number.

It is an amenable number.

1169155961 is a deficient number, since it is larger than the sum of its proper divisors (327211).

1169155961 is an equidigital number, since it uses as much as digits as its factorization.

1169155961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327210.

The product of its digits is 72900, while the sum is 44.

The square root of 1169155961 is about 34192.9226741441. The cubic root of 1169155961 is about 1053.4747952557.

The spelling of 1169155961 in words is "one billion, one hundred sixty-nine million, one hundred fifty-five thousand, nine hundred sixty-one".