51530511 has 16 divisors (see below), whose sum is σ = 71894016. Its totient is φ = 32768736.

The previous prime is 51530473. The next prime is 51530533. The reversal of 51530511 is 11503515.

It is a de Polignac number, because none of the positive numbers 2^k-51530511 is a prime.

It is a super-2 number, since 2×51530511² = 5310787127842242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51531511) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31141 + ... + 32753.

It is an arithmetic number, because the mean of its divisors is an integer number (4493376).

Almost surely, 2^51530511 is an apocalyptic number.

51530511 is a deficient number, since it is larger than the sum of its proper divisors (20363505).

51530511 is a wasteful number, since it uses less digits than its factorization.

51530511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102.

The product of its (nonzero) digits is 375, while the sum is 21.

The square root of 51530511 is about 7178.4755345407. The cubic root of 51530511 is about 372.1244019709.

The spelling of 51530511 in words is "fifty-one million, five hundred thirty thousand, five hundred eleven".