1899995061 has 4 divisors (see below), whose sum is σ = 2533326752. Its totient is φ = 1266663372.

The previous prime is 1899994979. The next prime is 1899995093. The reversal of 1899995061 is 1605999981.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1899995061 - 2¹⁰ = 1899994037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1899994992 and 1899995010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1899995261) 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, 316665841 + ... + 316665846.

It is an arithmetic number, because the mean of its divisors is an integer number (633331688).

Almost surely, 2^1899995061 is an apocalyptic number.

It is an amenable number.

1899995061 is a deficient number, since it is larger than the sum of its proper divisors (633331691).

1899995061 is an equidigital number, since it uses as much as digits as its factorization.

1899995061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633331690.

The product of its (nonzero) digits is 1574640, while the sum is 57.

The square root of 1899995061 is about 43588.9327811544. The cubic root of 1899995061 is about 1238.5612564258.

The spelling of 1899995061 in words is "one billion, eight hundred ninety-nine million, nine hundred ninety-five thousand, sixty-one".