6431387 has 2 divisors, whose sum is σ = 6431388. Its totient is φ = 6431386.

The previous prime is 6431363. The next prime is 6431401. The reversal of 6431387 is 7831346.

6431387 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6431387 - 2⁶ = 6431323 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6431687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3215693 + 3215694.

It is an arithmetic number, because the mean of its divisors is an integer number (3215694).

Almost surely, 2^6431387 is an apocalyptic number.

6431387 is a deficient number, since it is larger than the sum of its proper divisors (1).

6431387 is an equidigital number, since it uses as much as digits as its factorization.

6431387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 6431387 is about 2536.0179415769. The cubic root of 6431387 is about 185.9665700894.

The spelling of 6431387 in words is "six million, four hundred thirty-one thousand, three hundred eighty-seven".