51690143 has 8 divisors (see below), whose sum is σ = 52290048. Its totient is φ = 51093504.

The previous prime is 51690097. The next prime is 51690173. The reversal of 51690143 is 34109615.

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 51690143 - 2⁸ = 51689887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51690173) 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, 44255 + ... + 45407.

It is an arithmetic number, because the mean of its divisors is an integer number (6536256).

Almost surely, 2^51690143 is an apocalyptic number.

51690143 is a deficient number, since it is larger than the sum of its proper divisors (599905).

51690143 is a wasteful number, since it uses less digits than its factorization.

With its successor (51690144) it forms an eRAP, since the sums of their prime factors are consecutive (1633 and 1634).

51690143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1633.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 51690143 is about 7189.5857321545. The cubic root of 51690143 is about 372.5082634084.

Adding to 51690143 its reverse (34109615), we get a palindrome (85799758).

The spelling of 51690143 in words is "fifty-one million, six hundred ninety thousand, one hundred forty-three".