1331431 has 2 divisors, whose sum is σ = 1331432. Its totient is φ = 1331430.

The previous prime is 1331411. The next prime is 1331437. The reversal of 1331431 is 1341331.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1331431 - 2⁵ = 1331399 is a prime.

It is a super-2 number, since 2×1331431² = 3545417015522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665715 + 665716.

It is an arithmetic number, because the mean of its divisors is an integer number (665716).

2^1331431 is an apocalyptic number.

1331431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331431 is an equidigital number, since it uses as much as digits as its factorization.

1331431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108, while the sum is 16.

The square root of 1331431 is about 1153.8765098571. The cubic root of 1331431 is about 110.0118719969.

Adding to 1331431 its reverse (1341331), we get a palindrome (2672762).

The spelling of 1331431 in words is "one million, three hundred thirty-one thousand, four hundred thirty-one".