1642291 has 4 divisors (see below), whose sum is σ = 1876912. Its totient is φ = 1407672.

The previous prime is 1642283. The next prime is 1642297. The reversal of 1642291 is 1922461.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1642291 - 2³ = 1642283 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 6.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1642297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117300 + ... + 117313.

It is an arithmetic number, because the mean of its divisors is an integer number (469228).

2^1642291 is an apocalyptic number.

1642291 is a deficient number, since it is larger than the sum of its proper divisors (234621).

1642291 is an equidigital number, since it uses as much as digits as its factorization.

1642291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234620.

The product of its digits is 864, while the sum is 25.

The square root of 1642291 is about 1281.5190205377. The cubic root of 1642291 is about 117.9822581772.

The spelling of 1642291 in words is "one million, six hundred forty-two thousand, two hundred ninety-one".