161025206 has 4 divisors (see below), whose sum is σ = 241537812. Its totient is φ = 80512602.

The previous prime is 161025203. The next prime is 161025217. The reversal of 161025206 is 602520161.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161025203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40256300 + ... + 40256303.

It is an arithmetic number, because the mean of its divisors is an integer number (60384453).

Almost surely, 2^161025206 is an apocalyptic number.

161025206 is a deficient number, since it is larger than the sum of its proper divisors (80512606).

161025206 is an equidigital number, since it uses as much as digits as its factorization.

161025206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80512605.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 161025206 is about 12689.5707571218. The cubic root of 161025206 is about 544.0405710623.

Adding to 161025206 its reverse (602520161), we get a palindrome (763545367).

The spelling of 161025206 in words is "one hundred sixty-one million, twenty-five thousand, two hundred six".