121716645 has 16 divisors (see below), whose sum is σ = 196639872. Its totient is φ = 64284480.

The previous prime is 121716631. The next prime is 121716653. The reversal of 121716645 is 546617121.

It is not a de Polignac number, because 121716645 - 2⁸ = 121716389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37846 + ... + 40935.

It is an arithmetic number, because the mean of its divisors is an integer number (12289992).

Almost surely, 2^121716645 is an apocalyptic number.

121716645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121716645 is a deficient number, since it is larger than the sum of its proper divisors (74923227).

121716645 is a wasteful number, since it uses less digits than its factorization.

121716645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78892.

The product of its digits is 10080, while the sum is 33.

The square root of 121716645 is about 11032.5266824966. The cubic root of 121716645 is about 495.5832936202.

The spelling of 121716645 in words is "one hundred twenty-one million, seven hundred sixteen thousand, six hundred forty-five".