431023421 has 2 divisors, whose sum is σ = 431023422. Its totient is φ = 431023420.

The previous prime is 431023409. The next prime is 431023429. The reversal of 431023421 is 124320134.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 401200900 + 29822521 = 20030^2 + 5461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-431023421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 431023393 and 431023402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (431023429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215511710 + 215511711.

It is an arithmetic number, because the mean of its divisors is an integer number (215511711).

Almost surely, 2^431023421 is an apocalyptic number.

It is an amenable number.

431023421 is a deficient number, since it is larger than the sum of its proper divisors (1).

431023421 is an equidigital number, since it uses as much as digits as its factorization.

431023421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 431023421 is about 20761.1035593005. The cubic root of 431023421 is about 755.3825647694.

Adding to 431023421 its reverse (124320134), we get a palindrome (555343555).

The spelling of 431023421 in words is "four hundred thirty-one million, twenty-three thousand, four hundred twenty-one".