1625491 has 8 divisors (see below), whose sum is σ = 1883744. Its totient is φ = 1373760.

The previous prime is 1625483. The next prime is 1625497. The reversal of 1625491 is 1945261.

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 1625491 - 2³ = 1625483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1625497) 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 7 ways as a sum of consecutive naturals, for example, 1080 + ... + 2101.

It is an arithmetic number, because the mean of its divisors is an integer number (235468).

2^1625491 is an apocalyptic number.

1625491 is a deficient number, since it is larger than the sum of its proper divisors (258253).

1625491 is an equidigital number, since it uses as much as digits as its factorization.

1625491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3261.

The product of its digits is 2160, while the sum is 28.

The square root of 1625491 is about 1274.9474498974. The cubic root of 1625491 is about 117.5785742740.

It can be divided in two parts, 1625 and 491, that added together give a square (2116 = 46²).

The spelling of 1625491 in words is "one million, six hundred twenty-five thousand, four hundred ninety-one".