51076409 has 4 divisors (see below), whose sum is σ = 51097716. Its totient is φ = 51055104.

The previous prime is 51076379. The next prime is 51076433. The reversal of 51076409 is 90467015.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90467015 = 5 ⋅18093403.

It can be written as a sum of positive squares in 2 ways, for example, as 25351225 + 25725184 = 5035^2 + 5072^2 .

It is a cyclic number.

It is not a de Polignac number, because 51076409 - 2¹² = 51072313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51076439) 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, 6524 + ... + 12029.

It is an arithmetic number, because the mean of its divisors is an integer number (12774429).

Almost surely, 2^51076409 is an apocalyptic number.

It is an amenable number.

51076409 is a deficient number, since it is larger than the sum of its proper divisors (21307).

51076409 is a wasteful number, since it uses less digits than its factorization.

51076409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21306.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 51076409 is about 7146.7761263384. The cubic root of 51076409 is about 371.0280854349.

The spelling of 51076409 in words is "fifty-one million, seventy-six thousand, four hundred nine".