121315145 has 32 divisors (see below), whose sum is σ = 179532288. Its totient is φ = 76796928.

The previous prime is 121315127. The next prime is 121315163. The reversal of 121315145 is 541513121.

It is an interprime number because it is at equal distance from previous prime (121315127) and next prime (121315163).

It is a cyclic number.

It is not a de Polignac number, because 121315145 - 2⁶ = 121315081 is a prime.

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 121315145.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29612 + ... + 33458.

It is an arithmetic number, because the mean of its divisors is an integer number (5610384).

Almost surely, 2^121315145 is an apocalyptic number.

It is an amenable number.

121315145 is a deficient number, since it is larger than the sum of its proper divisors (58217143).

121315145 is a wasteful number, since it uses less digits than its factorization.

121315145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3929.

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

The square root of 121315145 is about 11014.3154576215. The cubic root of 121315145 is about 495.0377755751.

Adding to 121315145 its reverse (541513121), we get a palindrome (662828266).

The spelling of 121315145 in words is "one hundred twenty-one million, three hundred fifteen thousand, one hundred forty-five".