51945605 has 8 divisors (see below), whose sum is σ = 62790552. Its totient is φ = 41252608.

The previous prime is 51945589. The next prime is 51945617. The reversal of 51945605 is 50654915.

It can be written as a sum of positive squares in 4 ways, for example, as 16638241 + 35307364 = 4079^2 + 5942^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51945605 - 2⁴ = 51945589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37232 + ... + 38601.

It is an arithmetic number, because the mean of its divisors is an integer number (7848819).

Almost surely, 2^51945605 is an apocalyptic number.

It is an amenable number.

51945605 is a deficient number, since it is larger than the sum of its proper divisors (10844947).

51945605 is a wasteful number, since it uses less digits than its factorization.

51945605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75975.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 51945605 is about 7207.3299494334. The cubic root of 51945605 is about 373.1209228745.

The spelling of 51945605 in words is "fifty-one million, nine hundred forty-five thousand, six hundred five".