51520250 has 16 divisors (see below), whose sum is σ = 96446376. Its totient is φ = 20608000.

The previous prime is 51520247. The next prime is 51520277. The reversal of 51520250 is 5202515.

It can be written as a sum of positive squares in 4 ways, for example, as 13980121 + 37540129 = 3739^2 + 6127^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102791 + ... + 103290.

Almost surely, 2^51520250 is an apocalyptic number.

51520250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51520250 is a deficient number, since it is larger than the sum of its proper divisors (44926126).

51520250 is a wasteful number, since it uses less digits than its factorization.

51520250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206098 (or 206088 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 51520250 is about 7177.7607928936. The cubic root of 51520250 is about 372.0997006054.

Adding to 51520250 its reverse (5202515), we get a palindrome (56722765).

The spelling of 51520250 in words is "fifty-one million, five hundred twenty thousand, two hundred fifty".