51136869 has 8 divisors (see below), whose sum is σ = 77922880. Its totient is φ = 29221056.

The previous prime is 51136859. The next prime is 51136873. The reversal of 51136869 is 96863115.

51136869 = 1677² + 1678² + ... + 1694².

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

It is not a de Polignac number, because 51136869 - 2⁷ = 51136741 is a prime.

It is a super-2 number, since 2×51136869² = 5229958742246322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51136859) 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 7 ways as a sum of consecutive naturals, for example, 1217524 + ... + 1217565.

It is an arithmetic number, because the mean of its divisors is an integer number (9740360).

Almost surely, 2^51136869 is an apocalyptic number.

It is an amenable number.

51136869 is a deficient number, since it is larger than the sum of its proper divisors (26786011).

51136869 is a wasteful number, since it uses less digits than its factorization.

51136869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435099.

The product of its digits is 38880, while the sum is 39.

The square root of 51136869 is about 7151.0047545782. The cubic root of 51136869 is about 371.1744250929.

The spelling of 51136869 in words is "fifty-one million, one hundred thirty-six thousand, eight hundred sixty-nine".