51111930 has 16 divisors (see below), whose sum is σ = 122668704. Its totient is φ = 13629840.

The previous prime is 51111869. The next prime is 51111937. The reversal of 51111930 is 3911115.

It is a super-4 number, since 4×51111930⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 51111897 and 51111906.

It is not an unprimeable number, because it can be changed into a prime (51111937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 851836 + ... + 851895.

It is an arithmetic number, because the mean of its divisors is an integer number (7666794).

Almost surely, 2^51111930 is an apocalyptic number.

51111930 is an abundant number, since it is smaller than the sum of its proper divisors (71556774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51111930 is a wasteful number, since it uses less digits than its factorization.

51111930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703741.

The product of its (nonzero) digits is 135, while the sum is 21.

The square root of 51111930 is about 7149.2608009500. The cubic root of 51111930 is about 371.1140757835.

The spelling of 51111930 in words is "fifty-one million, one hundred eleven thousand, nine hundred thirty".