51520511 has 24 divisors (see below), whose sum is σ = 62052480. Its totient is φ = 42630000.

The previous prime is 51520499. The next prime is 51520583. The reversal of 51520511 is 11502515.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-51520511 is a prime.

It is a super-2 number, since 2×51520511² = 5308726107402242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51520411) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 205136 + ... + 205386.

It is an arithmetic number, because the mean of its divisors is an integer number (2585520).

Almost surely, 2^51520511 is an apocalyptic number.

51520511 is a deficient number, since it is larger than the sum of its proper divisors (10531969).

51520511 is a wasteful number, since it uses less digits than its factorization.

51520511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 51520511 is about 7177.7789740281. The cubic root of 51520511 is about 372.1003289529.

The spelling of 51520511 in words is "fifty-one million, five hundred twenty thousand, five hundred eleven".