1023455189 has 2 divisors, whose sum is σ = 1023455190. Its totient is φ = 1023455188.

The previous prime is 1023455149. The next prime is 1023455201. The reversal of 1023455189 is 9815543201.

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., 1015378225 + 8076964 = 31865^2 + 2842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1023455189 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023455149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511727594 + 511727595.

It is an arithmetic number, because the mean of its divisors is an integer number (511727595).

Almost surely, 2^1023455189 is an apocalyptic number.

It is an amenable number.

1023455189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023455189 is an equidigital number, since it uses as much as digits as its factorization.

1023455189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 1023455189 is about 31991.4861955490. The cubic root of 1023455189 is about 1007.7580532967.

The spelling of 1023455189 in words is "one billion, twenty-three million, four hundred fifty-five thousand, one hundred eighty-nine".