121122551 has 4 divisors (see below), whose sum is σ = 132133704. Its totient is φ = 110111400.

The previous prime is 121122527. The next prime is 121122559. The reversal of 121122551 is 155221121.

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 121122551 - 2²² = 116928247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121122559) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5505560 + ... + 5505581.

It is an arithmetic number, because the mean of its divisors is an integer number (33033426).

Almost surely, 2^121122551 is an apocalyptic number.

121122551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121122551 is a deficient number, since it is larger than the sum of its proper divisors (11011153).

121122551 is a wasteful number, since it uses less digits than its factorization.

121122551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11011152.

The product of its digits is 200, while the sum is 20.

The square root of 121122551 is about 11005.5690902379. The cubic root of 121122551 is about 494.7756708918.

Adding to 121122551 its reverse (155221121), we get a palindrome (276343672).

The spelling of 121122551 in words is "one hundred twenty-one million, one hundred twenty-two thousand, five hundred fifty-one".