1631161 has 6 divisors (see below), whose sum is σ = 1897530. Its totient is φ = 1398096.

The previous prime is 1631159. The next prime is 1631171. The reversal of 1631161 is 1611361.

It can be written as a sum of positive squares in only one way, i.e., 960400 + 670761 = 980^2 + 819^2 .

It is not a de Polignac number, because 1631161 - 2¹ = 1631159 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1631101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16596 + ... + 16693.

It is an arithmetic number, because the mean of its divisors is an integer number (316255).

2^1631161 is an apocalyptic number.

It is an amenable number.

1631161 is a deficient number, since it is larger than the sum of its proper divisors (266369).

1631161 is an equidigital number, since it uses as much as digits as its factorization.

1631161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33303 (or 33296 counting only the distinct ones).

The product of its digits is 108, while the sum is 19.

The square root of 1631161 is about 1277.1691352362. The cubic root of 1631161 is about 117.7151272416.

The spelling of 1631161 in words is "one million, six hundred thirty-one thousand, one hundred sixty-one".