851953381 has 2 divisors, whose sum is σ = 851953382. Its totient is φ = 851953380.

The previous prime is 851953357. The next prime is 851953409. The reversal of 851953381 is 183359158.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 831168900 + 20784481 = 28830^2 + 4559^2 .

It is a cyclic number.

It is not a de Polignac number, because 851953381 - 2¹³ = 851945189 is a prime.

It is a super-2 number, since 2×851953381² = 1451649126794662322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (851953481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425976690 + 425976691.

It is an arithmetic number, because the mean of its divisors is an integer number (425976691).

Almost surely, 2^851953381 is an apocalyptic number.

It is an amenable number.

851953381 is a deficient number, since it is larger than the sum of its proper divisors (1).

851953381 is an equidigital number, since it uses as much as digits as its factorization.

851953381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 43.

The square root of 851953381 is about 29188.2404574171. The cubic root of 851953381 is about 947.9933195925.

The spelling of 851953381 in words is "eight hundred fifty-one million, nine hundred fifty-three thousand, three hundred eighty-one".