121103551 has 4 divisors (see below), whose sum is σ = 121126504. Its totient is φ = 121080600.

The previous prime is 121103539. The next prime is 121103651. The reversal of 121103551 is 155301121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121103551 - 2¹¹ = 121101503 is a prime.

It is a super-4 number, since 4×121103551⁴ (a number of 33 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121103051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 856 + ... + 15586.

It is an arithmetic number, because the mean of its divisors is an integer number (30281626).

Almost surely, 2^121103551 is an apocalyptic number.

121103551 is a deficient number, since it is larger than the sum of its proper divisors (22953).

121103551 is an equidigital number, since it uses as much as digits as its factorization.

121103551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22952.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 121103551 is about 11004.7058570413. The cubic root of 121103551 is about 494.7497983926.

Adding to 121103551 its reverse (155301121), we get a palindrome (276404672).

The spelling of 121103551 in words is "one hundred twenty-one million, one hundred three thousand, five hundred fifty-one".