51661300 has 36 divisors (see below), whose sum is σ = 118703340. Its totient is φ = 19448320.

The previous prime is 51661277. The next prime is 51661303. The reversal of 51661300 is 316615.

It can be written as a sum of positive squares in 6 ways, for example, as 595984 + 51065316 = 772^2 + 7146^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51661303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13495 + ... + 16894.

It is an arithmetic number, because the mean of its divisors is an integer number (3297315).

Almost surely, 2^51661300 is an apocalyptic number.

51661300 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51661300 is an abundant number, since it is smaller than the sum of its proper divisors (67042040).

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

51661300 is a wasteful number, since it uses less digits than its factorization.

51661300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30420 (or 30413 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 51661300 is about 7187.5795647770. The cubic root of 51661300 is about 372.4389642199.

Adding to 51661300 its reverse (316615), we get a palindrome (51977915).

It can be divided in two parts, 516 and 61300, that added together give a palindrome (61816).

The spelling of 51661300 in words is "fifty-one million, six hundred sixty-one thousand, three hundred".