611605513 has 4 divisors (see below), whose sum is σ = 612019408. Its totient is φ = 611191620.

The previous prime is 611605507. The next prime is 611605529. The reversal of 611605513 is 315506116.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 611605513 - 2¹⁷ = 611474441 is a prime.

It is a super-3 number, since 3×611605513³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (611603513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204723 + ... + 207688.

It is an arithmetic number, because the mean of its divisors is an integer number (153004852).

Almost surely, 2^611605513 is an apocalyptic number.

It is an amenable number.

611605513 is a deficient number, since it is larger than the sum of its proper divisors (413895).

611605513 is a wasteful number, since it uses less digits than its factorization.

611605513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413894.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 611605513 is about 24730.6593725279. The cubic root of 611605513 is about 848.8360136902.

The spelling of 611605513 in words is "six hundred eleven million, six hundred five thousand, five hundred thirteen".