51508109 has 8 divisors (see below), whose sum is σ = 54998592. Its totient is φ = 48121920.

The previous prime is 51508073. The next prime is 51508117. The reversal of 51508109 is 90180515.

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

It is a cyclic number.

It is not a de Polignac number, because 51508109 - 2⁸ = 51507853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51508159) 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, 25052 + ... + 27029.

It is an arithmetic number, because the mean of its divisors is an integer number (6874824).

Almost surely, 2^51508109 is an apocalyptic number.

It is an amenable number.

51508109 is a deficient number, since it is larger than the sum of its proper divisors (3490483).

51508109 is a wasteful number, since it uses less digits than its factorization.

51508109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52147.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 51508109 is about 7176.9150057668. The cubic root of 51508109 is about 372.0704692683.

The spelling of 51508109 in words is "fifty-one million, five hundred eight thousand, one hundred nine".