161026005 has 24 divisors (see below), whose sum is σ = 299706912. Its totient is φ = 73611552.

The previous prime is 161026003. The next prime is 161026039. The reversal of 161026005 is 500620161.

It is a happy number.

It is not a de Polignac number, because 161026005 - 2¹ = 161026003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161026003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108807 + ... + 110276.

It is an arithmetic number, because the mean of its divisors is an integer number (12487788).

Almost surely, 2^161026005 is an apocalyptic number.

161026005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161026005 is a deficient number, since it is larger than the sum of its proper divisors (138680907).

161026005 is a wasteful number, since it uses less digits than its factorization.

161026005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219105 (or 219098 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 161026005 is about 12689.6022396291. The cubic root of 161026005 is about 544.0414708959.

Adding to 161026005 its reverse (500620161), we get a palindrome (661646166).

The spelling of 161026005 in words is "one hundred sixty-one million, twenty-six thousand, five".