423145501 has 2 divisors, whose sum is σ = 423145502. Its totient is φ = 423145500.

The previous prime is 423145493. The next prime is 423145529. The reversal of 423145501 is 105541324.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 246521401 + 176624100 = 15701^2 + 13290^2 .

It is a cyclic number.

It is not a de Polignac number, because 423145501 - 2³ = 423145493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423145571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211572750 + 211572751.

It is an arithmetic number, because the mean of its divisors is an integer number (211572751).

Almost surely, 2^423145501 is an apocalyptic number.

It is an amenable number.

423145501 is a deficient number, since it is larger than the sum of its proper divisors (1).

423145501 is an equidigital number, since it uses as much as digits as its factorization.

423145501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 423145501 is about 20570.5007474296. The cubic root of 423145501 is about 750.7521349534.

Adding to 423145501 its reverse (105541324), we get a palindrome (528686825).

It can be divided in two parts, 423 and 145501, that added together give a square (145924 = 382²).

The spelling of 423145501 in words is "four hundred twenty-three million, one hundred forty-five thousand, five hundred one".