857651149 has 2 divisors, whose sum is σ = 857651150. Its totient is φ = 857651148.

The previous prime is 857651143. The next prime is 857651213. The reversal of 857651149 is 941156758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 831457225 + 26193924 = 28835^2 + 5118^2 .

It is a cyclic number.

It is not a de Polignac number, because 857651149 - 2²⁹ = 320780237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 857651099 and 857651108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (857651143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428825574 + 428825575.

It is an arithmetic number, because the mean of its divisors is an integer number (428825575).

Almost surely, 2^857651149 is an apocalyptic number.

It is an amenable number.

857651149 is a deficient number, since it is larger than the sum of its proper divisors (1).

857651149 is an equidigital number, since it uses as much as digits as its factorization.

857651149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 46.

The square root of 857651149 is about 29285.6816379609. The cubic root of 857651149 is about 950.1019831421.

The spelling of 857651149 in words is "eight hundred fifty-seven million, six hundred fifty-one thousand, one hundred forty-nine".