1591641 has 6 divisors (see below), whose sum is σ = 2299050. Its totient is φ = 1061088.

The previous prime is 1591637. The next prime is 1591663. The reversal of 1591641 is 1461951.

1591641 is a `hidden beast` number, since 15 + 9 + 1 + 641 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1550025 + 41616 = 1245^2 + 204^2 .

It is not a de Polignac number, because 1591641 - 2² = 1591637 is a prime.

1591641 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1591621) 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, 88416 + ... + 88433.

It is an arithmetic number, because the mean of its divisors is an integer number (383175).

2^1591641 is an apocalyptic number.

It is an amenable number.

1591641 is a deficient number, since it is larger than the sum of its proper divisors (707409).

1591641 is a wasteful number, since it uses less digits than its factorization.

1591641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176855 (or 176852 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 1591641 is about 1261.6025523119. The cubic root of 1591641 is about 116.7566715891.

The spelling of 1591641 in words is "one million, five hundred ninety-one thousand, six hundred forty-one".