851512549 has 2 divisors, whose sum is σ = 851512550. Its totient is φ = 851512548.

The previous prime is 851512537. The next prime is 851512553. The reversal of 851512549 is 945215158.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611820225 + 239692324 = 24735^2 + 15482^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851512549 is a prime.

It is a super-2 number, since 2×851512549² = 1450147242208954802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851512349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425756274 + 425756275.

It is an arithmetic number, because the mean of its divisors is an integer number (425756275).

Almost surely, 2^851512549 is an apocalyptic number.

It is an amenable number.

851512549 is a deficient number, since it is larger than the sum of its proper divisors (1).

851512549 is an equidigital number, since it uses as much as digits as its factorization.

851512549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72000, while the sum is 40.

The square root of 851512549 is about 29180.6879459686. The cubic root of 851512549 is about 947.8297825175.

The spelling of 851512549 in words is "eight hundred fifty-one million, five hundred twelve thousand, five hundred forty-nine".