51631705 has 8 divisors (see below), whose sum is σ = 62572104. Its totient is φ = 40896000.

The previous prime is 51631663. The next prime is 51631747. The reversal of 51631705 is 50713615.

It is an interprime number because it is at equal distance from previous prime (51631663) and next prime (51631747).

It can be written as a sum of positive squares in 4 ways, for example, as 21557449 + 30074256 = 4643^2 + 5484^2 .

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

It is not a de Polignac number, because 51631705 - 2⁷ = 51631577 is a prime.

It is a super-2 number, since 2×51631705² = 5331665922414050, which contains 22 as substring.

It is a Duffinian 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, 50616 + ... + 51625.

It is an arithmetic number, because the mean of its divisors is an integer number (7821513).

Almost surely, 2^51631705 is an apocalyptic number.

It is an amenable number.

51631705 is a deficient number, since it is larger than the sum of its proper divisors (10940399).

51631705 is a wasteful number, since it uses less digits than its factorization.

51631705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102347.

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 51631705 is about 7185.5205100257. The cubic root of 51631705 is about 372.3678314340.

The spelling of 51631705 in words is "fifty-one million, six hundred thirty-one thousand, seven hundred five".