625689601 has 4 divisors (see below), whose sum is σ = 628422100. Its totient is φ = 622957104.

The previous prime is 625689599. The next prime is 625689611. The reversal of 625689601 is 106986526.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 106986526 = 2 ⋅53493263.

It can be written as a sum of positive squares in 2 ways, for example, as 592971201 + 32718400 = 24351^2 + 5720^2 .

It is a cyclic number.

It is not a de Polignac number, because 625689601 - 2¹ = 625689599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (625689611) 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, 1365906 + ... + 1366363.

It is an arithmetic number, because the mean of its divisors is an integer number (157105525).

Almost surely, 2^625689601 is an apocalyptic number.

It is an amenable number.

625689601 is a deficient number, since it is larger than the sum of its proper divisors (2732499).

625689601 is a wasteful number, since it uses less digits than its factorization.

625689601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732498.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 625689601 is about 25013.7882177011. The cubic root of 625689601 is about 855.3023113899.

The spelling of 625689601 in words is "six hundred twenty-five million, six hundred eighty-nine thousand, six hundred one".