1899999953 has 2 divisors, whose sum is σ = 1899999954. Its totient is φ = 1899999952.

The previous prime is 1899999949. The next prime is 1899999979. The reversal of 1899999953 is 3599999981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1792421569 + 107578384 = 42337^2 + 10372^2 .

It is a cyclic number.

It is not a de Polignac number, because 1899999953 - 2² = 1899999949 is a prime.

It is not a weakly prime, because it can be changed into another prime (1899999923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 949999976 + 949999977.

It is an arithmetic number, because the mean of its divisors is an integer number (949999977).

Almost surely, 2^1899999953 is an apocalyptic number.

It is an amenable number.

1899999953 is a deficient number, since it is larger than the sum of its proper divisors (1).

1899999953 is an equidigital number, since it uses as much as digits as its factorization.

1899999953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63772920, while the sum is 71.

The square root of 1899999953 is about 43588.9888962798. The cubic root of 1899999953 is about 1238.5623194175.

The spelling of 1899999953 in words is "one billion, eight hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred fifty-three".