121541605 has 8 divisors (see below), whose sum is σ = 146915352. Its totient is φ = 96523008.

The previous prime is 121541573. The next prime is 121541611. The reversal of 121541605 is 506145121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 57121 + 121484484 = 239^2 + 11022^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 121541605 - 2⁵ = 121541573 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121541605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88032 + ... + 89401.

It is an arithmetic number, because the mean of its divisors is an integer number (18364419).

Almost surely, 2^121541605 is an apocalyptic number.

It is an amenable number.

121541605 is a deficient number, since it is larger than the sum of its proper divisors (25373747).

121541605 is a wasteful number, since it uses less digits than its factorization.

121541605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177575.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 121541605 is about 11024.5909221159. The cubic root of 121541605 is about 495.3456144970.

Adding to 121541605 its reverse (506145121), we get a palindrome (627686726).

The spelling of 121541605 in words is "one hundred twenty-one million, five hundred forty-one thousand, six hundred five".