402431311 has 2 divisors, whose sum is σ = 402431312. Its totient is φ = 402431310.

The previous prime is 402431303. The next prime is 402431317. The reversal of 402431311 is 113134204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402431311 - 2³ = 402431303 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402431317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201215655 + 201215656.

It is an arithmetic number, because the mean of its divisors is an integer number (201215656).

Almost surely, 2^402431311 is an apocalyptic number.

402431311 is a deficient number, since it is larger than the sum of its proper divisors (1).

402431311 is an equidigital number, since it uses as much as digits as its factorization.

402431311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 402431311 is about 20060.6906910006. The cubic root of 402431311 is about 738.2961229910.

Adding to 402431311 its reverse (113134204), we get a palindrome (515565515).

The spelling of 402431311 in words is "four hundred two million, four hundred thirty-one thousand, three hundred eleven".