51690946 has 16 divisors (see below), whose sum is σ = 78572448. Its totient is φ = 25502400.

The previous prime is 51690943. The next prime is 51690949. The reversal of 51690946 is 64909615.

51690946 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51690943) and next prime (51690949).

It is a junction number, because it is equal to n+sod(n) for n = 51690899 and 51690908.

It is not an unprimeable number, because it can be changed into a prime (51690941) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 74461 + ... + 75151.

It is an arithmetic number, because the mean of its divisors is an integer number (4910778).

Almost surely, 2^51690946 is an apocalyptic number.

51690946 is a deficient number, since it is larger than the sum of its proper divisors (26881502).

51690946 is a wasteful number, since it uses less digits than its factorization.

51690946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1137.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 51690946 is about 7189.6415766017. The cubic root of 51690946 is about 372.5101923551.

The spelling of 51690946 in words is "fifty-one million, six hundred ninety thousand, nine hundred forty-six".