612517561 has 4 divisors (see below), whose sum is σ = 632276224. Its totient is φ = 592758900.

The previous prime is 612517537. The next prime is 612517567. The reversal of 612517561 is 165715216.

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 612517561 - 2¹¹ = 612515513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (612517567) 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, 9879285 + ... + 9879346.

It is an arithmetic number, because the mean of its divisors is an integer number (158069056).

Almost surely, 2^612517561 is an apocalyptic number.

It is an amenable number.

612517561 is a deficient number, since it is larger than the sum of its proper divisors (19758663).

612517561 is a wasteful number, since it uses less digits than its factorization.

612517561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19758662.

The product of its digits is 12600, while the sum is 34.

The square root of 612517561 is about 24749.0921247629. The cubic root of 612517561 is about 849.2577423278.

The spelling of 612517561 in words is "six hundred twelve million, five hundred seventeen thousand, five hundred sixty-one".