51908929 has 4 divisors (see below), whose sum is σ = 51989076. Its totient is φ = 51828784.

The previous prime is 51908917. The next prime is 51908933. The reversal of 51908929 is 92980915.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92980915 = 5 ⋅18596183.

It can be written as a sum of positive squares in 2 ways, for example, as 30305025 + 21603904 = 5505^2 + 4648^2 .

It is a cyclic number.

It is not a de Polignac number, because 51908929 - 2¹⁵ = 51876161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51908959) 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, 39094 + ... + 40399.

It is an arithmetic number, because the mean of its divisors is an integer number (12997269).

Almost surely, 2^51908929 is an apocalyptic number.

It is an amenable number.

51908929 is a deficient number, since it is larger than the sum of its proper divisors (80147).

51908929 is an equidigital number, since it uses as much as digits as its factorization.

51908929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80146.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 51908929 is about 7204.7851459985. The cubic root of 51908929 is about 373.0330886559.

The spelling of 51908929 in words is "fifty-one million, nine hundred eight thousand, nine hundred twenty-nine".