1291161 has 8 divisors (see below), whose sum is σ = 1761760. Its totient is φ = 840672.

The previous prime is 1291159. The next prime is 1291163. The reversal of 1291161 is 1611921.

It is an interprime number because it is at equal distance from previous prime (1291159) and next prime (1291163).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1291161 - 2¹ = 1291159 is a prime.

It is a Duffinian number.

1291161 is a modest number, since divided by 1161 gives 129 as remainder.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1291163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4876 + ... + 5133.

It is an arithmetic number, because the mean of its divisors is an integer number (220220).

2^1291161 is an apocalyptic number.

It is an amenable number.

1291161 is a deficient number, since it is larger than the sum of its proper divisors (470599).

1291161 is a wasteful number, since it uses less digits than its factorization.

1291161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10055.

The product of its digits is 108, while the sum is 21.

The square root of 1291161 is about 1136.2926559650. The cubic root of 1291161 is about 108.8913711699.

It can be divided in two parts, 129 and 1161, that multiplied together give a square (149769 = 387²).

The spelling of 1291161 in words is "one million, two hundred ninety-one thousand, one hundred sixty-one".