51091630 has 32 divisors (see below), whose sum is σ = 97822080. Its totient is φ = 19146240.

The previous prime is 51091609. The next prime is 51091631. The reversal of 51091630 is 3619015.

51091630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51091630² = 5220709312113800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51091595 and 51091604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51091631) 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 15 ways as a sum of consecutive naturals, for example, 45516 + ... + 46624.

It is an arithmetic number, because the mean of its divisors is an integer number (3056940).

Almost surely, 2^51091630 is an apocalyptic number.

51091630 is a deficient number, since it is larger than the sum of its proper divisors (46730450).

51091630 is a wasteful number, since it uses less digits than its factorization.

51091630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 51091630 is about 7147.8409327572. The cubic root of 51091630 is about 371.0649377882.

The spelling of 51091630 in words is "fifty-one million, ninety-one thousand, six hundred thirty".