1625001 has 16 divisors (see below), whose sum is σ = 2494464. Its totient is φ = 921744.

The previous prime is 1624993. The next prime is 1625017. The reversal of 1625001 is 1005261.

It is not a de Polignac number, because 1625001 - 2³ = 1624993 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1625021) 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 15 ways as a sum of consecutive naturals, for example, 4510 + ... + 4856.

It is an arithmetic number, because the mean of its divisors is an integer number (155904).

2^1625001 is an apocalyptic number.

1625001 is the 1041-st pentagonal number.

It is an amenable number.

1625001 is a deficient number, since it is larger than the sum of its proper divisors (869463).

1625001 is a wasteful number, since it uses less digits than its factorization.

1625001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580.

The product of its (nonzero) digits is 60, while the sum is 15.

The square root of 1625001 is about 1274.7552706304. The cubic root of 1625001 is about 117.5667585023.

The spelling of 1625001 in words is "one million, six hundred twenty-five thousand, one".