1625971 has 4 divisors (see below), whose sum is σ = 1648944. Its totient is φ = 1603000.

The previous prime is 1625969. The next prime is 1625977. The reversal of 1625971 is 1795261.

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

It is a cyclic number.

It is not a de Polignac number, because 1625971 - 2¹ = 1625969 is a prime.

It is a Duffinian number.

1625971 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1625977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11380 + ... + 11521.

It is an arithmetic number, because the mean of its divisors is an integer number (412236).

2^1625971 is an apocalyptic number.

1625971 is a deficient number, since it is larger than the sum of its proper divisors (22973).

1625971 is an equidigital number, since it uses as much as digits as its factorization.

1625971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22972.

The product of its digits is 3780, while the sum is 31.

The square root of 1625971 is about 1275.1356790554. The cubic root of 1625971 is about 117.5901466053.

The spelling of 1625971 in words is "one million, six hundred twenty-five thousand, nine hundred seventy-one".