1423625009 has 2 divisors, whose sum is σ = 1423625010. Its totient is φ = 1423625008.

The previous prime is 1423624967. The next prime is 1423625011. The reversal of 1423625009 is 9005263241.

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., 1403626225 + 19998784 = 37465^2 + 4472^2 .

It is a cyclic number.

It is not a de Polignac number, because 1423625009 - 2⁸ = 1423624753 is a prime.

It is a Sophie Germain prime.

Together with 1423625011, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1423625039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 711812504 + 711812505.

It is an arithmetic number, because the mean of its divisors is an integer number (711812505).

Almost surely, 2^1423625009 is an apocalyptic number.

It is an amenable number.

1423625009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1423625009 is an equidigital number, since it uses as much as digits as its factorization.

1423625009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1423625009 is about 37730.9555802659. The cubic root of 1423625009 is about 1124.9465018840.

The spelling of 1423625009 in words is "one billion, four hundred twenty-three million, six hundred twenty-five thousand, nine".