51690530 has 8 divisors (see below), whose sum is σ = 93042972. Its totient is φ = 20676208.

The previous prime is 51690503. The next prime is 51690539. The reversal of 51690530 is 3509615.

It can be written as a sum of positive squares in 2 ways, for example, as 51423241 + 267289 = 7171^2 + 517^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 51690493 and 51690502.

It is not an unprimeable number, because it can be changed into a prime (51690539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2584517 + ... + 2584536.

Almost surely, 2^51690530 is an apocalyptic number.

51690530 is a deficient number, since it is larger than the sum of its proper divisors (41352442).

51690530 is a wasteful number, since it uses less digits than its factorization.

51690530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5169060.

The product of its (nonzero) digits is 4050, while the sum is 29.

The square root of 51690530 is about 7189.6126460332. The cubic root of 51690530 is about 372.5091930527.

The spelling of 51690530 in words is "fifty-one million, six hundred ninety thousand, five hundred thirty".