51690427 has 8 divisors (see below), whose sum is σ = 52366496. Its totient is φ = 51017472.

The previous prime is 51690413. The next prime is 51690437. The reversal of 51690427 is 72409615.

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 51690427 - 2¹⁹ = 51166139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51690392 and 51690401.

It is not an unprimeable number, because it can be changed into a prime (51690437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70153 + ... + 70885.

It is an arithmetic number, because the mean of its divisors is an integer number (6545812).

Almost surely, 2^51690427 is an apocalyptic number.

51690427 is a deficient number, since it is larger than the sum of its proper divisors (676069).

51690427 is an equidigital number, since it uses as much as digits as its factorization.

51690427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 51690427 is about 7189.6054829177. The cubic root of 51690427 is about 372.5089456284.

The spelling of 51690427 in words is "fifty-one million, six hundred ninety thousand, four hundred twenty-seven".