121645005 has 16 divisors (see below), whose sum is σ = 195645120. Its totient is φ = 64539648.

The previous prime is 121644931. The next prime is 121645019. The reversal of 121645005 is 500546121.

It is not a de Polignac number, because 121645005 - 2⁸ = 121644749 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 18115 + ... + 23904.

It is an arithmetic number, because the mean of its divisors is an integer number (12227820).

Almost surely, 2^121645005 is an apocalyptic number.

121645005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121645005 is a deficient number, since it is larger than the sum of its proper divisors (74000115).

121645005 is a wasteful number, since it uses less digits than its factorization.

121645005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42220.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 121645005 is about 11029.2794415592. The cubic root of 121645005 is about 495.4860443765.

The spelling of 121645005 in words is "one hundred twenty-one million, six hundred forty-five thousand, five".