625000001 has 4 divisors (see below), whose sum is σ = 627593604. Its totient is φ = 622406400.

The previous prime is 624999989. The next prime is 625000027. The reversal of 625000001 is 100000526.

It is a Cunningham number, because it is equal to 25000²+1.

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

It can be written as a sum of positive squares in 2 ways, for example, as 470022400 + 154977601 = 21680^2 + 12449^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-625000001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 625000001.

It is not an unprimeable number, because it can be changed into a prime (625005001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1296440 + ... + 1296921.

It is an arithmetic number, because the mean of its divisors is an integer number (156898401).

Almost surely, 2^625000001 is an apocalyptic number.

It is an amenable number.

625000001 is a deficient number, since it is larger than the sum of its proper divisors (2593603).

625000001 is a wasteful number, since it uses less digits than its factorization.

625000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2593602.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 625000001 is about 25000.0000200000. Note that the first 4 decimals coincide. The cubic root of 625000001 is about 854.9879737943.

Adding to 625000001 its reverse (100000526), we get a palindrome (725000527).

The spelling of 625000001 in words is "six hundred twenty-five million, one", and thus it is an aban number.