1851406061 has 2 divisors, whose sum is σ = 1851406062. Its totient is φ = 1851406060.

The previous prime is 1851406049. The next prime is 1851406133. The reversal of 1851406061 is 1606041581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1508934025 + 342472036 = 38845^2 + 18506^2 .

It is an emirp because it is prime and its reverse (1606041581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1851406061 - 2¹⁴ = 1851389677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1851406021) 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, 925703030 + 925703031.

It is an arithmetic number, because the mean of its divisors is an integer number (925703031).

Almost surely, 2^1851406061 is an apocalyptic number.

It is an amenable number.

1851406061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851406061 is an equidigital number, since it uses as much as digits as its factorization.

1851406061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 1851406061 is about 43027.9683578019. The cubic root of 1851406061 is about 1227.9119531864.

The spelling of 1851406061 in words is "one billion, eight hundred fifty-one million, four hundred six thousand, sixty-one".