231601625 has 32 divisors (see below), whose sum is σ = 310441248. Its totient is φ = 171878400.

The previous prime is 231601613. The next prime is 231601663. The reversal of 231601625 is 526106132.

It can be written as a sum of positive squares in 16 ways, for example, as 75151561 + 156450064 = 8669^2 + 12508^2 .

It is not a de Polignac number, because 231601625 - 2¹⁰ = 231600601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231601594 and 231601603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154379 + ... + 155871.

It is an arithmetic number, because the mean of its divisors is an integer number (9701289).

Almost surely, 2^231601625 is an apocalyptic number.

231601625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

231601625 is a deficient number, since it is larger than the sum of its proper divisors (78839623).

231601625 is a wasteful number, since it uses less digits than its factorization.

231601625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598 (or 1588 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 231601625 is about 15218.4632929872. The cubic root of 231601625 is about 614.1114584023. Note that the first 3 decimals are identical.

Adding to 231601625 its reverse (526106132), we get a palindrome (757707757).

The spelling of 231601625 in words is "two hundred thirty-one million, six hundred one thousand, six hundred twenty-five".