51861485 has 8 divisors (see below), whose sum is σ = 67021080. Its totient is φ = 38297664.

The previous prime is 51861451. The next prime is 51861493. The reversal of 51861485 is 58416815.

It can be written as a sum of positive squares in 4 ways, for example, as 438244 + 51423241 = 662^2 + 7171^2 .

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 51861485 - 2¹⁰ = 51860461 is a prime.

It is a super-2 number, since 2×51861485² = 5379227252810450, which contains 22 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 7 ways as a sum of consecutive naturals, for example, 398870 + ... + 398999.

It is an arithmetic number, because the mean of its divisors is an integer number (8377635).

Almost surely, 2^51861485 is an apocalyptic number.

It is an amenable number.

51861485 is a deficient number, since it is larger than the sum of its proper divisors (15159595).

51861485 is a wasteful number, since it uses less digits than its factorization.

51861485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797887.

The product of its digits is 38400, while the sum is 38.

The square root of 51861485 is about 7201.4918593303. The cubic root of 51861485 is about 372.9194050893.

The spelling of 51861485 in words is "fifty-one million, eight hundred sixty-one thousand, four hundred eighty-five".