51903191 has 2 divisors, whose sum is σ = 51903192. Its totient is φ = 51903190.

The previous prime is 51903179. The next prime is 51903197. The reversal of 51903191 is 19130915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51903191 - 2¹⁸ = 51641047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51903197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25951595 + 25951596.

It is an arithmetic number, because the mean of its divisors is an integer number (25951596).

Almost surely, 2^51903191 is an apocalyptic number.

51903191 is a deficient number, since it is larger than the sum of its proper divisors (1).

51903191 is an equidigital number, since it uses as much as digits as its factorization.

51903191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1215, while the sum is 29.

The square root of 51903191 is about 7204.3869274214. The cubic root of 51903191 is about 373.0193431547.

The spelling of 51903191 in words is "fifty-one million, nine hundred three thousand, one hundred ninety-one".