161630125 has 32 divisors (see below), whose sum is σ = 212419584. Its totient is φ = 122616000.

The previous prime is 161630123. The next prime is 161630143. The reversal of 161630125 is 521036161.

161630125 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161630125 - 2¹ = 161630123 is a prime.

It is a super-2 number, since 2×161630125² = 52248594615031250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an alternating number because its digits alternate between odd and even.

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 161630125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161630123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204982 + ... + 205768.

It is an arithmetic number, because the mean of its divisors is an integer number (6638112).

Almost surely, 2^161630125 is an apocalyptic number.

It is an amenable number.

161630125 is a deficient number, since it is larger than the sum of its proper divisors (50789459).

161630125 is an equidigital number, since it uses as much as digits as its factorization.

161630125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886 (or 876 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 161630125 is about 12713.3836959324. The cubic root of 161630125 is about 544.7209805392.

Adding to 161630125 its reverse (521036161), we get a palindrome (682666286).

The spelling of 161630125 in words is "one hundred sixty-one million, six hundred thirty thousand, one hundred twenty-five".