51149499 has 4 divisors (see below), whose sum is σ = 68199336. Its totient is φ = 34099664.

The previous prime is 51149479. The next prime is 51149507. The reversal of 51149499 is 99494115.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 51149499 - 2¹² = 51145403 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51149499.

It is not an unprimeable number, because it can be changed into a prime (51149459) 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, 8524914 + ... + 8524919.

It is an arithmetic number, because the mean of its divisors is an integer number (17049834).

Almost surely, 2^51149499 is an apocalyptic number.

51149499 is a deficient number, since it is larger than the sum of its proper divisors (17049837).

51149499 is a wasteful number, since it uses less digits than its factorization.

51149499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17049836.

The product of its digits is 58320, while the sum is 42.

The square root of 51149499 is about 7151.8877927440. The cubic root of 51149499 is about 371.2049806535.

The spelling of 51149499 in words is "fifty-one million, one hundred forty-nine thousand, four hundred ninety-nine".