431315221 has 2 divisors, whose sum is σ = 431315222. Its totient is φ = 431315220.

The previous prime is 431315207. The next prime is 431315233. The reversal of 431315221 is 122513134.

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., 390852900 + 40462321 = 19770^2 + 6361^2 .

It is a cyclic number.

It is not a de Polignac number, because 431315221 - 2¹¹ = 431313173 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 431315192 and 431315201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431315321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215657610 + 215657611.

It is an arithmetic number, because the mean of its divisors is an integer number (215657611).

Almost surely, 2^431315221 is an apocalyptic number.

It is an amenable number.

431315221 is a deficient number, since it is larger than the sum of its proper divisors (1).

431315221 is an equidigital number, since it uses as much as digits as its factorization.

431315221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 431315221 is about 20768.1299350712. The cubic root of 431315221 is about 755.5529893135.

Adding to 431315221 its reverse (122513134), we get a palindrome (553828355).

The spelling of 431315221 in words is "four hundred thirty-one million, three hundred fifteen thousand, two hundred twenty-one".