6391025 has 6 divisors (see below), whose sum is σ = 7924902. Its totient is φ = 5112800.

The previous prime is 6391009. The next prime is 6391043. The reversal of 6391025 is 5201936.

It can be written as a sum of positive squares in 3 ways, for example, as 20449 + 6370576 = 143^2 + 2524^2 .

It is not a de Polignac number, because 6391025 - 2⁴ = 6391009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6390985 and 6391003.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127796 + ... + 127845.

It is an arithmetic number, because the mean of its divisors is an integer number (1320817).

Almost surely, 2^6391025 is an apocalyptic number.

It is an amenable number.

6391025 is a deficient number, since it is larger than the sum of its proper divisors (1533877).

6391025 is a wasteful number, since it uses less digits than its factorization.

6391025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255651 (or 255646 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 6391025 is about 2528.0476656899. The cubic root of 6391025 is about 185.5767247028.

The spelling of 6391025 in words is "six million, three hundred ninety-one thousand, twenty-five".