51161650 has 24 divisors (see below), whose sum is σ = 96238260. Its totient is φ = 20232960.

The previous prime is 51161647. The next prime is 51161659. The reversal of 51161650 is 5616115.

It can be written as a sum of positive squares in 6 ways, for example, as 12981609 + 38180041 = 3603^2 + 6179^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (51161659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1299 + ... + 10198.

Almost surely, 2^51161650 is an apocalyptic number.

51161650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51161650 is a deficient number, since it is larger than the sum of its proper divisors (45076610).

51161650 is a wasteful number, since it uses less digits than its factorization.

51161650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11598 (or 11593 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 51161650 is about 7152.7372382886. The cubic root of 51161650 is about 371.2343726299.

Adding to 51161650 its reverse (5616115), we get a palindrome (56777765).

The spelling of 51161650 in words is "fifty-one million, one hundred sixty-one thousand, six hundred fifty".