121131545 has 8 divisors (see below), whose sum is σ = 153908424. Its totient is φ = 91204864.

The previous prime is 121131541. The next prime is 121131551. The reversal of 121131545 is 545131121.

It can be written as a sum of positive squares in 4 ways, for example, as 40921609 + 80209936 = 6397^2 + 8956^2 .

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

It is not a de Polignac number, because 121131545 - 2² = 121131541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121131545.

It is not an unprimeable number, because it can be changed into a prime (121131541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 712454 + ... + 712623.

It is an arithmetic number, because the mean of its divisors is an integer number (19238553).

Almost surely, 2^121131545 is an apocalyptic number.

It is an amenable number.

121131545 is a deficient number, since it is larger than the sum of its proper divisors (32776879).

121131545 is a wasteful number, since it uses less digits than its factorization.

121131545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1425099.

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

The square root of 121131545 is about 11005.9776939625. The cubic root of 121131545 is about 494.7879171724.

Adding to 121131545 its reverse (545131121), we get a palindrome (666262666).

The spelling of 121131545 in words is "one hundred twenty-one million, one hundred thirty-one thousand, five hundred forty-five".