121531145 has 8 divisors (see below), whose sum is σ = 145976904. Its totient is φ = 97131904.

The previous prime is 121531127. The next prime is 121531153. The reversal of 121531145 is 541135121.

It can be written as a sum of positive squares in 4 ways, for example, as 19035769 + 102495376 = 4363^2 + 10124^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121531145 - 2¹⁰ = 121530121 is a prime.

It is a super-2 number, since 2×121531145² = 29539638410022050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121531145.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5594 + ... + 16563.

It is an arithmetic number, because the mean of its divisors is an integer number (18247113).

Almost surely, 2^121531145 is an apocalyptic number.

It is an amenable number.

121531145 is a deficient number, since it is larger than the sum of its proper divisors (24445759).

121531145 is a wasteful number, since it uses less digits than its factorization.

121531145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23259.

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

The square root of 121531145 is about 11024.1165178893. The cubic root of 121531145 is about 495.3314040989.

Adding to 121531145 its reverse (541135121), we get a palindrome (662666266).

The spelling of 121531145 in words is "one hundred twenty-one million, five hundred thirty-one thousand, one hundred forty-five".