51101730 has 48 divisors (see below), whose sum is σ = 133641144. Its totient is φ = 13547520.

The previous prime is 51101723. The next prime is 51101731. The reversal of 51101730 is 3710115.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 42263001 + 8838729 = 6501^2 + 2973^2 .

It is a super-2 number, since 2×51101730² = 5222773617985800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51101731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14722 + ... + 17858.

Almost surely, 2^51101730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51101730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66820572).

51101730 is an abundant number, since it is smaller than the sum of its proper divisors (82539414).

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

51101730 is a wasteful number, since it uses less digits than its factorization.

51101730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3331 (or 3328 counting only the distinct ones).

The product of its (nonzero) digits is 105, while the sum is 18.

The square root of 51101730 is about 7148.5474048928. The cubic root of 51101730 is about 371.0893873829.

Adding to 51101730 its reverse (3710115), we get a palindrome (54811845).

The spelling of 51101730 in words is "fifty-one million, one hundred one thousand, seven hundred thirty".