51545100 has 72 divisors (see below), whose sum is σ = 157003840. Its totient is φ = 13020480.

The previous prime is 51545099. The next prime is 51545101. The reversal of 51545100 is 154515.

It is an interprime number because it is at equal distance from previous prime (51545099) and next prime (51545101).

It is not an unprimeable number, because it can be changed into a prime (51545101) 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, 1179 + ... + 10221.

Almost surely, 2^51545100 is an apocalyptic number.

51545100 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51545100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78501920).

51545100 is an abundant number, since it is smaller than the sum of its proper divisors (105458740).

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

51545100 is a wasteful number, since it uses less digits than its factorization.

51545100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9079 (or 9072 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 51545100 is about 7179.4916254565. The cubic root of 51545100 is about 372.1595165114.

Adding to 51545100 its reverse (154515), we get a palindrome (51699615).

The spelling of 51545100 in words is "fifty-one million, five hundred forty-five thousand, one hundred".