1858631849 has 2 divisors, whose sum is σ = 1858631850. Its totient is φ = 1858631848.

The previous prime is 1858631839. The next prime is 1858631857. The reversal of 1858631849 is 9481368581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1013276224 + 845355625 = 31832^2 + 29075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1858631849 - 2⁴ = 1858631833 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1858631849.

It is not a weakly prime, because it can be changed into another prime (1858631809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 929315924 + 929315925.

It is an arithmetic number, because the mean of its divisors is an integer number (929315925).

Almost surely, 2^1858631849 is an apocalyptic number.

It is an amenable number.

1858631849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1858631849 is an equidigital number, since it uses as much as digits as its factorization.

1858631849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1658880, while the sum is 53.

The square root of 1858631849 is about 43111.8527669596. The cubic root of 1858631849 is about 1229.5073376731.

The spelling of 1858631849 in words is "one billion, eight hundred fifty-eight million, six hundred thirty-one thousand, eight hundred forty-nine".