51690142 has 16 divisors (see below), whose sum is σ = 88704000. Its totient is φ = 22129848.

The previous prime is 51690097. The next prime is 51690173. The reversal of 51690142 is 24109615.

It is a self number, because there is not a number n which added to its sum of digits gives 51690142.

It is a congruent 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, 24859 + ... + 26857.

It is an arithmetic number, because the mean of its divisors is an integer number (5544000).

Almost surely, 2^51690142 is an apocalyptic number.

51690142 is a deficient number, since it is larger than the sum of its proper divisors (37013858).

51690142 is a wasteful number, since it uses less digits than its factorization.

51690142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3855.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 51690142 is about 7189.5856626095. The cubic root of 51690142 is about 372.5082610062.

Adding to 51690142 its reverse (24109615), we get a palindrome (75799757).

The spelling of 51690142 in words is "fifty-one million, six hundred ninety thousand, one hundred forty-two".