1953453989 has 2 divisors, whose sum is σ = 1953453990. Its totient is φ = 1953453988.

The previous prime is 1953453967. The next prime is 1953454001. The reversal of 1953453989 is 9893543591.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1602641089 + 350812900 = 40033^2 + 18730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1953453989 - 2¹⁶ = 1953388453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1953453919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 976726994 + 976726995.

It is an arithmetic number, because the mean of its divisors is an integer number (976726995).

Almost surely, 2^1953453989 is an apocalyptic number.

It is an amenable number.

1953453989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1953453989 is an equidigital number, since it uses as much as digits as its factorization.

1953453989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5248800, while the sum is 56.

The square root of 1953453989 is about 44197.8957530786. The cubic root of 1953453989 is about 1250.0701803797.

The spelling of 1953453989 in words is "one billion, nine hundred fifty-three million, four hundred fifty-three thousand, nine hundred eighty-nine".