51645203 has 2 divisors, whose sum is σ = 51645204. Its totient is φ = 51645202.

The previous prime is 51645179. The next prime is 51645221. The reversal of 51645203 is 30254615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51645203 - 2⁸ = 51644947 is a prime.

It is a super-2 number, since 2×51645203² = 5334453985822418, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (51645233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25822601 + 25822602.

It is an arithmetic number, because the mean of its divisors is an integer number (25822602).

Almost surely, 2^51645203 is an apocalyptic number.

51645203 is a deficient number, since it is larger than the sum of its proper divisors (1).

51645203 is an equidigital number, since it uses as much as digits as its factorization.

51645203 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 51645203 is about 7186.4596986277. The cubic root of 51645203 is about 372.4002777965.

Adding to 51645203 its reverse (30254615), we get a palindrome (81899818).

The spelling of 51645203 in words is "fifty-one million, six hundred forty-five thousand, two hundred three".