51645485 has 8 divisors (see below), whose sum is σ = 62013336. Its totient is φ = 41290560.

The previous prime is 51645469. The next prime is 51645493. The reversal of 51645485 is 58454615.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19166884 + 32478601 = 4378^2 + 5699^2 .

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

It is not a de Polignac number, because 51645485 - 2⁴ = 51645469 is a prime.

It is a super-2 number, since 2×51645485² = 5334512241770450, which contains 22 as substring.

It is a Duffinian 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, 12815 + ... + 16355.

It is an arithmetic number, because the mean of its divisors is an integer number (7751667).

Almost surely, 2^51645485 is an apocalyptic number.

It is an amenable number.

51645485 is a deficient number, since it is larger than the sum of its proper divisors (10367851).

51645485 is a wasteful number, since it uses less digits than its factorization.

51645485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6463.

The product of its digits is 96000, while the sum is 38.

The square root of 51645485 is about 7186.4793188320. The cubic root of 51645485 is about 372.4009556051.

The spelling of 51645485 in words is "fifty-one million, six hundred forty-five thousand, four hundred eighty-five".