51193690 has 32 divisors (see below), whose sum is σ = 94303440. Its totient is φ = 20004864.

The previous prime is 51193673. The next prime is 51193711. The reversal of 51193690 is 9639115.

51193690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 15421329 + 35772361 = 3927^2 + 5981^2 .

It is a super-2 number, since 2×51193690² = 5241587791632200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86034 + ... + 86626.

Almost surely, 2^51193690 is an apocalyptic number.

51193690 is a deficient number, since it is larger than the sum of its proper divisors (43109750).

51193690 is a wasteful number, since it uses less digits than its factorization.

51193690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 786.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 51193690 is about 7154.9765897590. The cubic root of 51193690 is about 371.3118516740.

The spelling of 51193690 in words is "fifty-one million, one hundred ninety-three thousand, six hundred ninety".