51905499 has 4 divisors (see below), whose sum is σ = 69207336. Its totient is φ = 34603664.

The previous prime is 51905489. The next prime is 51905509. The reversal of 51905499 is 99450915.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (51905489) and next prime (51905509).

It is a cyclic number.

It is not a de Polignac number, because 51905499 - 2¹² = 51901403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51905499.

It is not an unprimeable number, because it can be changed into a prime (51905419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8650914 + ... + 8650919.

It is an arithmetic number, because the mean of its divisors is an integer number (17301834).

Almost surely, 2^51905499 is an apocalyptic number.

51905499 is a deficient number, since it is larger than the sum of its proper divisors (17301837).

51905499 is a wasteful number, since it uses less digits than its factorization.

51905499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17301836.

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 51905499 is about 7204.5471058214. The cubic root of 51905499 is about 373.0248721396.

The spelling of 51905499 in words is "fifty-one million, nine hundred five thousand, four hundred ninety-nine".