121311553 has 8 divisors (see below), whose sum is σ = 136903680. Its totient is φ = 106480080.

The previous prime is 121311551. The next prime is 121311581. The reversal of 121311553 is 355113121.

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 121311553 - 2¹ = 121311551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121311551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189825 + ... + 190462.

It is an arithmetic number, because the mean of its divisors is an integer number (17112960).

Almost surely, 2^121311553 is an apocalyptic number.

It is an amenable number.

121311553 is a deficient number, since it is larger than the sum of its proper divisors (15592127).

121311553 is a wasteful number, since it uses less digits than its factorization.

121311553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380327.

The product of its digits is 450, while the sum is 22.

The square root of 121311553 is about 11014.1523958950. The cubic root of 121311553 is about 495.0328896964.

Adding to 121311553 its reverse (355113121), we get a palindrome (476424674).

The spelling of 121311553 in words is "one hundred twenty-one million, three hundred eleven thousand, five hundred fifty-three".