121311513 has 10 divisors (see below), whose sum is σ = 181218554. Its totient is φ = 80874288.

The previous prime is 121311503. The next prime is 121311517. The reversal of 121311513 is 315113121.

121311513 is a `hidden beast` number, since 121 + 31 + 1 + 513 = 666.

It can be written as a sum of positive squares in only one way, i.e., 107495424 + 13816089 = 10368^2 + 3717^2 .

It is not a de Polignac number, because 121311513 - 2⁵ = 121311481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121311517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 748756 + ... + 748917.

Almost surely, 2^121311513 is an apocalyptic number.

It is an amenable number.

121311513 is a deficient number, since it is larger than the sum of its proper divisors (59907041).

121311513 is an equidigital number, since it uses as much as digits as its factorization.

121311513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1497685 (or 1497676 counting only the distinct ones).

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

The square root of 121311513 is about 11014.1505800493. The cubic root of 121311513 is about 495.0328352874.

Adding to 121311513 its reverse (315113121), we get a palindrome (436424634).

The spelling of 121311513 in words is "one hundred twenty-one million, three hundred eleven thousand, five hundred thirteen".