851841401 has 2 divisors, whose sum is σ = 851841402. Its totient is φ = 851841400.

The previous prime is 851841391. The next prime is 851841413. The reversal of 851841401 is 104148158.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 824551225 + 27290176 = 28715^2 + 5224^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-851841401 is a prime.

It is not a weakly prime, because it can be changed into another prime (851841701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 425920700 + 425920701.

It is an arithmetic number, because the mean of its divisors is an integer number (425920701).

Almost surely, 2^851841401 is an apocalyptic number.

It is an amenable number.

851841401 is a deficient number, since it is larger than the sum of its proper divisors (1).

851841401 is an equidigital number, since it uses as much as digits as its factorization.

851841401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5120, while the sum is 32.

The square root of 851841401 is about 29186.3221561059. The cubic root of 851841401 is about 947.9517833043.

Adding to 851841401 its reverse (104148158), we get a palindrome (955989559).

The spelling of 851841401 in words is "eight hundred fifty-one million, eight hundred forty-one thousand, four hundred one".