51539469 has 8 divisors (see below), whose sum is σ = 68789952. Its totient is φ = 34324320.

The previous prime is 51539443. The next prime is 51539491. The reversal of 51539469 is 96493515.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51539469 - 2⁵ = 51539437 is a prime.

It is a super-2 number, since 2×51539469² = 5312633729603922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51539469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51539269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5217 + ... + 11414.

It is an arithmetic number, because the mean of its divisors is an integer number (8598744).

Almost surely, 2^51539469 is an apocalyptic number.

It is an amenable number.

51539469 is a deficient number, since it is larger than the sum of its proper divisors (17250483).

51539469 is a wasteful number, since it uses less digits than its factorization.

51539469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17667.

The product of its digits is 145800, while the sum is 42.

The square root of 51539469 is about 7179.0994560599. The cubic root of 51539469 is about 372.1459639361.

The spelling of 51539469 in words is "fifty-one million, five hundred thirty-nine thousand, four hundred sixty-nine".