851632813 has 2 divisors, whose sum is σ = 851632814. Its totient is φ = 851632812.

The previous prime is 851632807. The next prime is 851632829. The reversal of 851632813 is 318236158.

851632813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 486555364 + 365077449 = 22058^2 + 19107^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851632813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851638813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425816406 + 425816407.

It is an arithmetic number, because the mean of its divisors is an integer number (425816407).

Almost surely, 2^851632813 is an apocalyptic number.

It is an amenable number.

851632813 is a deficient number, since it is larger than the sum of its proper divisors (1).

851632813 is an equidigital number, since it uses as much as digits as its factorization.

851632813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 37.

The square root of 851632813 is about 29182.7485511560. The cubic root of 851632813 is about 947.8744028953.

The spelling of 851632813 in words is "eight hundred fifty-one million, six hundred thirty-two thousand, eight hundred thirteen".