121351605 has 8 divisors (see below), whose sum is σ = 194162592. Its totient is φ = 64720848.

The previous prime is 121351597. The next prime is 121351621. The reversal of 121351605 is 506153121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121351605 - 2³ = 121351597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4045039 + ... + 4045068.

It is an arithmetic number, because the mean of its divisors is an integer number (24270324).

Almost surely, 2^121351605 is an apocalyptic number.

121351605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121351605 is a deficient number, since it is larger than the sum of its proper divisors (72810987).

121351605 is an equidigital number, since it uses as much as digits as its factorization.

121351605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8090115.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 121351605 is about 11015.9704520301. The cubic root of 121351605 is about 495.0873634191.

The spelling of 121351605 in words is "one hundred twenty-one million, three hundred fifty-one thousand, six hundred five".