51645157 has 2 divisors, whose sum is σ = 51645158. Its totient is φ = 51645156.

The previous prime is 51645137. The next prime is 51645179. The reversal of 51645157 is 75154615.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51638596 + 6561 = 7186^2 + 81^2 .

It is a cyclic number.

It is not a de Polignac number, because 51645157 - 2⁷ = 51645029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51645137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25822578 + 25822579.

It is an arithmetic number, because the mean of its divisors is an integer number (25822579).

Almost surely, 2^51645157 is an apocalyptic number.

It is an amenable number.

51645157 is a deficient number, since it is larger than the sum of its proper divisors (1).

51645157 is an equidigital number, since it uses as much as digits as its factorization.

51645157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21000, while the sum is 34.

The square root of 51645157 is about 7186.4564981638. The cubic root of 51645157 is about 372.4001672317.

The spelling of 51645157 in words is "fifty-one million, six hundred forty-five thousand, one hundred fifty-seven".