121513311 has 8 divisors (see below), whose sum is σ = 180019760. Its totient is φ = 81008856.

The previous prime is 121513279. The next prime is 121513321. The reversal of 121513311 is 113315121.

121513311 is a `hidden beast` number, since 121 + 513 + 31 + 1 = 666.

It is not a de Polignac number, because 121513311 - 2⁵ = 121513279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121513321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2250220 + ... + 2250273.

It is an arithmetic number, because the mean of its divisors is an integer number (22502470).

Almost surely, 2^121513311 is an apocalyptic number.

121513311 is a deficient number, since it is larger than the sum of its proper divisors (58506449).

121513311 is an equidigital number, since it uses as much as digits as its factorization.

121513311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500502 (or 4500496 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 121513311 is about 11023.3076252094. The cubic root of 121513311 is about 495.3071738974.

Adding to 121513311 its reverse (113315121), we get a palindrome (234828432).

The spelling of 121513311 in words is "one hundred twenty-one million, five hundred thirteen thousand, three hundred eleven".