51995649 has 8 divisors (see below), whose sum is σ = 71564032. Its totient is φ = 33545520.

The previous prime is 51995641. The next prime is 51995653. The reversal of 51995649 is 94659915.

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

It is not a de Polignac number, because 51995649 - 2³ = 51995641 is a prime.

It is a super-3 number, since 3×51995649³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51995598 and 51995607.

It is not an unprimeable number, because it can be changed into a prime (51995641) 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, 279454 + ... + 279639.

It is an arithmetic number, because the mean of its divisors is an integer number (8945504).

Almost surely, 2^51995649 is an apocalyptic number.

It is an amenable number.

51995649 is a deficient number, since it is larger than the sum of its proper divisors (19568383).

51995649 is a wasteful number, since it uses less digits than its factorization.

51995649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559127.

The product of its digits is 437400, while the sum is 48.

The square root of 51995649 is about 7210.8008570477. The cubic root of 51995649 is about 373.2407050349.

The spelling of 51995649 in words is "fifty-one million, nine hundred ninety-five thousand, six hundred forty-nine".