215431423 has 2 divisors, whose sum is σ = 215431424. Its totient is φ = 215431422.

The previous prime is 215431357. The next prime is 215431439. The reversal of 215431423 is 324134512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215431423 - 2²¹ = 213334271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215431523) 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, 107715711 + 107715712.

It is an arithmetic number, because the mean of its divisors is an integer number (107715712).

Almost surely, 2^215431423 is an apocalyptic number.

215431423 is a deficient number, since it is larger than the sum of its proper divisors (1).

215431423 is an equidigital number, since it uses as much as digits as its factorization.

215431423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 25.

The square root of 215431423 is about 14677.5823281629. The cubic root of 215431423 is about 599.4730772042.

Adding to 215431423 its reverse (324134512), we get a palindrome (539565935).

The spelling of 215431423 in words is "two hundred fifteen million, four hundred thirty-one thousand, four hundred twenty-three".