161321235 has 16 divisors (see below), whose sum is σ = 258466464. Its totient is φ = 85920512.

The previous prime is 161321233. The next prime is 161321243. The reversal of 161321235 is 532123161.

It is a cyclic number.

It is not a de Polignac number, because 161321235 - 2¹ = 161321233 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161321233) 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 in 15 ways as a sum of consecutive naturals, for example, 4639 + ... + 18551.

It is an arithmetic number, because the mean of its divisors is an integer number (16154154).

Almost surely, 2^161321235 is an apocalyptic number.

161321235 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161321235 is a deficient number, since it is larger than the sum of its proper divisors (97145229).

161321235 is a wasteful number, since it uses less digits than its factorization.

161321235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14694.

The product of its digits is 1080, while the sum is 24.

The square root of 161321235 is about 12701.2296648789. The cubic root of 161321235 is about 544.3737553263.

Adding to 161321235 its reverse (532123161), we get a palindrome (693444396).

The spelling of 161321235 in words is "one hundred sixty-one million, three hundred twenty-one thousand, two hundred thirty-five".