161231030 has 16 divisors (see below), whose sum is σ = 290648304. Its totient is φ = 64396320.

The previous prime is 161230987. The next prime is 161231051. The reversal of 161231030 is 30132161.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 4757 + ... + 18576.

It is an arithmetic number, because the mean of its divisors is an integer number (18165519).

Almost surely, 2^161231030 is an apocalyptic number.

161231030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161231030 is a deficient number, since it is larger than the sum of its proper divisors (129417274).

161231030 is a wasteful number, since it uses less digits than its factorization.

161231030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24031.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 161231030 is about 12697.6781342102. The cubic root of 161231030 is about 544.2722717036.

Adding to 161231030 its reverse (30132161), we get a palindrome (191363191).

The spelling of 161231030 in words is "one hundred sixty-one million, two hundred thirty-one thousand, thirty".