51530269 has 4 divisors (see below), whose sum is σ = 58891744. Its totient is φ = 44168796.

The previous prime is 51530263. The next prime is 51530273. The reversal of 51530269 is 96203515.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 51530269 - 2¹³ = 51522077 is a prime.

It is a super-2 number, since 2×51530269² = 5310737246424722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51530269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51530263) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3680727 + ... + 3680740.

It is an arithmetic number, because the mean of its divisors is an integer number (14722936).

Almost surely, 2^51530269 is an apocalyptic number.

It is an amenable number.

51530269 is a deficient number, since it is larger than the sum of its proper divisors (7361475).

51530269 is an equidigital number, since it uses as much as digits as its factorization.

51530269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7361474.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 51530269 is about 7178.4586785744. The cubic root of 51530269 is about 372.1238194406.

The spelling of 51530269 in words is "fifty-one million, five hundred thirty thousand, two hundred sixty-nine".