51917903 has 2 divisors, whose sum is σ = 51917904. Its totient is φ = 51917902.

The previous prime is 51917897. The next prime is 51917927. The reversal of 51917903 is 30971915.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51917903 - 2²⁴ = 35140687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51917933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25958951 + 25958952.

It is an arithmetic number, because the mean of its divisors is an integer number (25958952).

Almost surely, 2^51917903 is an apocalyptic number.

51917903 is a deficient number, since it is larger than the sum of its proper divisors (1).

51917903 is an equidigital number, since it uses as much as digits as its factorization.

51917903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 51917903 is about 7205.4078996265. The cubic root of 51917903 is about 373.0545840332.

The spelling of 51917903 in words is "fifty-one million, nine hundred seventeen thousand, nine hundred three".