1953988189 has 2 divisors, whose sum is σ = 1953988190. Its totient is φ = 1953988188.

The previous prime is 1953988151. The next prime is 1953988229. The reversal of 1953988189 is 9818893591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1796912100 + 157076089 = 42390^2 + 12533^2 .

It is a cyclic number.

It is not a de Polignac number, because 1953988189 - 2⁷ = 1953988061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1953989189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 976994094 + 976994095.

It is an arithmetic number, because the mean of its divisors is an integer number (976994095).

Almost surely, 2^1953988189 is an apocalyptic number.

It is an amenable number.

1953988189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1953988189 is an equidigital number, since it uses as much as digits as its factorization.

1953988189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 61.

The square root of 1953988189 is about 44203.9386141099. The cubic root of 1953988189 is about 1250.1841198652.

The spelling of 1953988189 in words is "one billion, nine hundred fifty-three million, nine hundred eighty-eight thousand, one hundred eighty-nine".