121551145 has 4 divisors (see below), whose sum is σ = 145861380. Its totient is φ = 97240912.

The previous prime is 121551109. The next prime is 121551161. The reversal of 121551145 is 541155121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 95785369 + 25765776 = 9787^2 + 5076^2 .

It is a cyclic number.

It is not a de Polignac number, because 121551145 - 2⁹ = 121550633 is a prime.

It is a super-2 number, since 2×121551145² = 29549361701622050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12155110 + ... + 12155119.

It is an arithmetic number, because the mean of its divisors is an integer number (36465345).

Almost surely, 2^121551145 is an apocalyptic number.

It is an amenable number.

121551145 is a deficient number, since it is larger than the sum of its proper divisors (24310235).

121551145 is an equidigital number, since it uses as much as digits as its factorization.

121551145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24310234.

The product of its digits is 1000, while the sum is 25.

The square root of 121551145 is about 11025.0235827412. The cubic root of 121551145 is about 495.3585743213.

The spelling of 121551145 in words is "one hundred twenty-one million, five hundred fifty-one thousand, one hundred forty-five".