612115513 has 4 divisors (see below), whose sum is σ = 612709108. Its totient is φ = 611521920.

The previous prime is 612115477. The next prime is 612115523. The reversal of 612115513 is 315511216.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 564395049 + 47720464 = 23757^2 + 6908^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-612115513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612115523) 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 3 ways as a sum of consecutive naturals, for example, 295248 + ... + 297313.

It is an arithmetic number, because the mean of its divisors is an integer number (153177277).

Almost surely, 2^612115513 is an apocalyptic number.

It is an amenable number.

612115513 is a deficient number, since it is larger than the sum of its proper divisors (593595).

612115513 is a wasteful number, since it uses less digits than its factorization.

612115513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593594.

The product of its digits is 900, while the sum is 25.

The square root of 612115513 is about 24740.9683116890. The cubic root of 612115513 is about 849.0718880047.

Adding to 612115513 its reverse (315511216), we get a palindrome (927626729).

The spelling of 612115513 in words is "six hundred twelve million, one hundred fifteen thousand, five hundred thirteen".