121245513 has 16 divisors (see below), whose sum is σ = 171455040. Its totient is φ = 75949056.

The previous prime is 121245499. The next prime is 121245533. The reversal of 121245513 is 315542121.

It is a happy number.

It is not a de Polignac number, because 121245513 - 2⁹ = 121245001 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121245533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36081 + ... + 39297.

It is an arithmetic number, because the mean of its divisors is an integer number (10715940).

Almost surely, 2^121245513 is an apocalyptic number.

It is an amenable number.

121245513 is a deficient number, since it is larger than the sum of its proper divisors (50209527).

121245513 is a wasteful number, since it uses less digits than its factorization.

121245513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3976.

The product of its digits is 1200, while the sum is 24.

The square root of 121245513 is about 11011.1540267131. The cubic root of 121245513 is about 494.9430441559.

Adding to 121245513 its reverse (315542121), we get a palindrome (436787634).

It can be divided in two parts, 1212 and 45513, that multiplied together give a triangular number (55161756 = T₁₀₅₀₃).

The spelling of 121245513 in words is "one hundred twenty-one million, two hundred forty-five thousand, five hundred thirteen".