121129551 has 6 divisors (see below), whose sum is σ = 174964920. Its totient is φ = 80753028.

The previous prime is 121129529. The next prime is 121129553. The reversal of 121129551 is 155921121.

It is not a de Polignac number, because 121129551 - 2⁶ = 121129487 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121129553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6729411 + ... + 6729428.

It is an arithmetic number, because the mean of its divisors is an integer number (29160820).

Almost surely, 2^121129551 is an apocalyptic number.

121129551 is a deficient number, since it is larger than the sum of its proper divisors (53835369).

121129551 is a wasteful number, since it uses less digits than its factorization.

121129551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13458845 (or 13458842 counting only the distinct ones).

The product of its digits is 900, while the sum is 27.

The square root of 121129551 is about 11005.8871064535. The cubic root of 121129551 is about 494.7852021832.

It can be divided in two parts, 1211295 and 51, that added together give a triangular number (1211346 = T₁₅₅₆).

The spelling of 121129551 in words is "one hundred twenty-one million, one hundred twenty-nine thousand, five hundred fifty-one".