431123551 has 2 divisors, whose sum is σ = 431123552. Its totient is φ = 431123550.

The previous prime is 431123507. The next prime is 431123579. The reversal of 431123551 is 155321134.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 431123551 - 2⁹ = 431123039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431123591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215561775 + 215561776.

It is an arithmetic number, because the mean of its divisors is an integer number (215561776).

Almost surely, 2^431123551 is an apocalyptic number.

431123551 is a deficient number, since it is larger than the sum of its proper divisors (1).

431123551 is an equidigital number, since it uses as much as digits as its factorization.

431123551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 431123551 is about 20763.5148999393. The cubic root of 431123551 is about 755.4410539345.

Adding to 431123551 its reverse (155321134), we get a palindrome (586444685).

It can be divided in two parts, 43112355 and 1, that added together give a square (43112356 = 6566²).

The spelling of 431123551 in words is "four hundred thirty-one million, one hundred twenty-three thousand, five hundred fifty-one".