1625891 has 4 divisors (see below), whose sum is σ = 1669872. Its totient is φ = 1581912.

The previous prime is 1625879. The next prime is 1625903. The reversal of 1625891 is 1985261.

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

It is an interprime number because it is at equal distance from previous prime (1625879) and next prime (1625903).

It is a cyclic number.

It is not a de Polignac number, because 1625891 - 2¹⁴ = 1609507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1625821) 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, 21935 + ... + 22008.

It is an arithmetic number, because the mean of its divisors is an integer number (417468).

2^1625891 is an apocalyptic number.

1625891 is a deficient number, since it is larger than the sum of its proper divisors (43981).

1625891 is an equidigital number, since it uses as much as digits as its factorization.

1625891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43980.

The product of its digits is 4320, while the sum is 32.

The square root of 1625891 is about 1275.1043094586. The cubic root of 1625891 is about 117.5882180416.

The spelling of 1625891 in words is "one million, six hundred twenty-five thousand, eight hundred ninety-one".