612001645 has 16 divisors (see below), whose sum is σ = 780266160. Its totient is φ = 459938304.

The previous prime is 612001639. The next prime is 612001657. The reversal of 612001645 is 546100216.

It can be written as a sum of positive squares in 8 ways, for example, as 1022121 + 610979524 = 1011^2 + 24718^2 .

It is a cyclic number.

It is not a de Polignac number, because 612001645 - 2⁹ = 612001133 is a prime.

It is a super-3 number, since 3×612001645³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51672 + ... + 62401.

It is an arithmetic number, because the mean of its divisors is an integer number (48766635).

Almost surely, 2^612001645 is an apocalyptic number.

It is an amenable number.

612001645 is a deficient number, since it is larger than the sum of its proper divisors (168264515).

612001645 is a wasteful number, since it uses less digits than its factorization.

612001645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114144.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 612001645 is about 24738.6670012756. The cubic root of 612001645 is about 849.0192355715.

The spelling of 612001645 in words is "six hundred twelve million, one thousand, six hundred forty-five".