1851000061 has 2 divisors, whose sum is σ = 1851000062. Its totient is φ = 1851000060.

The previous prime is 1850999993. The next prime is 1851000077. The reversal of 1851000061 is 1600001581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1705194436 + 145805625 = 41294^2 + 12075^2 .

It is an emirp because it is prime and its reverse (1600001581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1851000061 - 2¹⁷ = 1850868989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1850999996 and 1851000041.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1851000161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925500030 + 925500031.

It is an arithmetic number, because the mean of its divisors is an integer number (925500031).

Almost surely, 2^1851000061 is an apocalyptic number.

It is an amenable number.

1851000061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851000061 is an equidigital number, since it uses as much as digits as its factorization.

1851000061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 22.

The square root of 1851000061 is about 43023.2502375169. The cubic root of 1851000061 is about 1227.8221892120.

The spelling of 1851000061 in words is "one billion, eight hundred fifty-one million, sixty-one", and thus it is an aban number.