121143551 has 4 divisors (see below), whose sum is σ = 121226400. Its totient is φ = 121060704.

The previous prime is 121143521. The next prime is 121143569. The reversal of 121143551 is 155341121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121143551 is a prime.

It is a super-3 number, since 3×121143551³ (a number of 25 digits) contains 333 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 (121143511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39191 + ... + 42168.

It is an arithmetic number, because the mean of its divisors is an integer number (30306600).

Almost surely, 2^121143551 is an apocalyptic number.

121143551 is a deficient number, since it is larger than the sum of its proper divisors (82849).

121143551 is an equidigital number, since it uses as much as digits as its factorization.

121143551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82848.

The product of its digits is 600, while the sum is 23.

The square root of 121143551 is about 11006.5231113190. The cubic root of 121143551 is about 494.8042636644.

Adding to 121143551 its reverse (155341121), we get a palindrome (276484672).

The spelling of 121143551 in words is "one hundred twenty-one million, one hundred forty-three thousand, five hundred fifty-one".