51090250 has 16 divisors (see below), whose sum is σ = 95641416. Its totient is φ = 20436000.

The previous prime is 51090241. The next prime is 51090271. The reversal of 51090250 is 5209015.

It can be written as a sum of positive squares in 4 ways, for example, as 25070049 + 26020201 = 5007^2 + 5101^2 .

It is a super-2 number, since 2×51090250² = 5220427290125000, which contains 22 as substring.

It is a congruent number.

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, 101931 + ... + 102430.

Almost surely, 2^51090250 is an apocalyptic number.

51090250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51090250 is a deficient number, since it is larger than the sum of its proper divisors (44551166).

51090250 is a wasteful number, since it uses less digits than its factorization.

51090250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204378 (or 204368 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 51090250 is about 7147.7443994592. The cubic root of 51090250 is about 371.0615969003.

Adding to 51090250 its reverse (5209015), we get a palindrome (56299265).

The spelling of 51090250 in words is "fifty-one million, ninety thousand, two hundred fifty".