1641551 has 8 divisors (see below), whose sum is σ = 1687200. Its totient is φ = 1596672.

The previous prime is 1641539. The next prime is 1641559. The reversal of 1641551 is 1551461.

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

It is a cyclic number.

It is not a de Polignac number, because 1641551 - 2¹⁴ = 1625167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641559) 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, 8150 + ... + 8348.

It is an arithmetic number, because the mean of its divisors is an integer number (210900).

2^1641551 is an apocalyptic number.

1641551 is a deficient number, since it is larger than the sum of its proper divisors (45649).

1641551 is a wasteful number, since it uses less digits than its factorization.

1641551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385.

The product of its digits is 600, while the sum is 23.

The square root of 1641551 is about 1281.2302681407. The cubic root of 1641551 is about 117.9645349707.

The spelling of 1641551 in words is "one million, six hundred forty-one thousand, five hundred fifty-one".