1851604541 has 4 divisors (see below), whose sum is σ = 1853776092. Its totient is φ = 1849432992.

The previous prime is 1851604537. The next prime is 1851604591. The reversal of 1851604541 is 1454061581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1454061581 = 7 ⋅207723083.

It can be written as a sum of positive squares in 2 ways, for example, as 616082041 + 1235522500 = 24821^2 + 35150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1851604541 - 2² = 1851604537 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1851604591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1084496 + ... + 1086201.

It is an arithmetic number, because the mean of its divisors is an integer number (463444023).

Almost surely, 2^1851604541 is an apocalyptic number.

It is an amenable number.

1851604541 is a deficient number, since it is larger than the sum of its proper divisors (2171551).

1851604541 is an equidigital number, since it uses as much as digits as its factorization.

1851604541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2171550.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 1851604541 is about 43030.2747028182. The cubic root of 1851604541 is about 1227.9558310550.

The spelling of 1851604541 in words is "one billion, eight hundred fifty-one million, six hundred four thousand, five hundred forty-one".