51020515 has 48 divisors (see below), whose sum is σ = 78025248. Its totient is φ = 31739904.

The previous prime is 51020507. The next prime is 51020527. The reversal of 51020515 is 51502015.

It is not a de Polignac number, because 51020515 - 2³ = 51020507 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51020492 and 51020501.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 264259 + ... + 264451.

It is an arithmetic number, because the mean of its divisors is an integer number (1625526).

Almost surely, 2^51020515 is an apocalyptic number.

51020515 is a deficient number, since it is larger than the sum of its proper divisors (27004733).

51020515 is a wasteful number, since it uses less digits than its factorization.

51020515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308 (or 301 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 19.

The square root of 51020515 is about 7142.8646214247. The cubic root of 51020515 is about 370.8926947292.

It can be divided in two parts, 510 and 20515, that added together give a square (21025 = 145²).

The spelling of 51020515 in words is "fifty-one million, twenty thousand, five hundred fifteen".