612105653 has 4 divisors (see below), whose sum is σ = 644321760. Its totient is φ = 579889548.

The previous prime is 612105649. The next prime is 612105677. The reversal of 612105653 is 356501216.

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 612105653 - 2² = 612105649 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612105623) 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, 16108025 + ... + 16108062.

It is an arithmetic number, because the mean of its divisors is an integer number (161080440).

Almost surely, 2^612105653 is an apocalyptic number.

It is an amenable number.

612105653 is a deficient number, since it is larger than the sum of its proper divisors (32216107).

612105653 is a wasteful number, since it uses less digits than its factorization.

612105653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32216106.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 612105653 is about 24740.7690462524. The cubic root of 612105653 is about 849.0673290102.

Adding to 612105653 its reverse (356501216), we get a palindrome (968606869).

The spelling of 612105653 in words is "six hundred twelve million, one hundred five thousand, six hundred fifty-three".