51097440 has 48 divisors (see below), whose sum is σ = 160958448. Its totient is φ = 13625856.

The previous prime is 51097381. The next prime is 51097471. The reversal of 51097440 is 4479015.

It is a happy number.

51097440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-3 number, since 3×51097440³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51097398 and 51097407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52747 + ... + 53706.

It is an arithmetic number, because the mean of its divisors is an integer number (3353301).

Almost surely, 2^51097440 is an apocalyptic number.

It is an amenable number.

51097440 is an abundant number, since it is smaller than the sum of its proper divisors (109861008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51097440 is a wasteful number, since it uses less digits than its factorization.

51097440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106471 (or 106463 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 51097440 is about 7148.2473376346. The cubic root of 51097440 is about 371.0790027506.

The spelling of 51097440 in words is "fifty-one million, ninety-seven thousand, four hundred forty".