1851001601 has 2 divisors, whose sum is σ = 1851001602. Its totient is φ = 1851001600.

The previous prime is 1851001591. The next prime is 1851001609. The reversal of 1851001601 is 1061001581.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1295928001 + 555073600 = 35999^2 + 23560^2 .

It is a cyclic number.

It is not a de Polignac number, because 1851001601 - 2²² = 1846807297 is a prime.

It is not a weakly prime, because it can be changed into another prime (1851001609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925500800 + 925500801.

It is an arithmetic number, because the mean of its divisors is an integer number (925500801).

Almost surely, 2^1851001601 is an apocalyptic number.

It is an amenable number.

1851001601 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851001601 is an equidigital number, since it uses as much as digits as its factorization.

1851001601 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 23.

The square root of 1851001601 is about 43023.2681348128. The cubic root of 1851001601 is about 1227.8225297208.

The spelling of 1851001601 in words is "one billion, eight hundred fifty-one million, one thousand, six hundred one".