161212625 has 32 divisors (see below), whose sum is σ = 242062080. Its totient is φ = 104716800.

The previous prime is 161212619. The next prime is 161212627. The reversal of 161212625 is 526212161.

It is not a de Polignac number, because 161212625 - 2⁶ = 161212561 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161212594 and 161212603.

It is not an unprimeable number, because it can be changed into a prime (161212627) 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, 11777 + ... + 21473.

It is an arithmetic number, because the mean of its divisors is an integer number (7564440).

Almost surely, 2^161212625 is an apocalyptic number.

It is an amenable number.

161212625 is a deficient number, since it is larger than the sum of its proper divisors (80849455).

161212625 is an equidigital number, since it uses as much as digits as its factorization.

161212625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9738 (or 9728 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 161212625 is about 12696.9533747273. The cubic root of 161212625 is about 544.2515608177.

Adding to 161212625 its reverse (526212161), we get a palindrome (687424786).

The spelling of 161212625 in words is "one hundred sixty-one million, two hundred twelve thousand, six hundred twenty-five".