1161639 has 12 divisors (see below), whose sum is σ = 1687296. Its totient is φ = 770112.

The previous prime is 1161637. The next prime is 1161647. The reversal of 1161639 is 9361611.

1161639 is a `hidden beast` number, since 11 + 616 + 39 = 666.

It is not a de Polignac number, because 1161639 - 2¹ = 1161637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2842 + ... + 3224.

It is an arithmetic number, because the mean of its divisors is an integer number (140608).

2^1161639 is an apocalyptic number.

1161639 is a deficient number, since it is larger than the sum of its proper divisors (525657).

1161639 is a wasteful number, since it uses less digits than its factorization.

1161639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726 (or 723 counting only the distinct ones).

The product of its digits is 972, while the sum is 27.

The square root of 1161639 is about 1077.7935794947. The cubic root of 1161639 is about 105.1212205435.

Adding to 1161639 its product of digits (972), we get a palindrome (1162611).

The spelling of 1161639 in words is "one million, one hundred sixty-one thousand, six hundred thirty-nine".