2106431 has 2 divisors, whose sum is σ = 2106432. Its totient is φ = 2106430.

The previous prime is 2106427. The next prime is 2106437. The reversal of 2106431 is 1346012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2106431 - 2² = 2106427 is a prime.

It is a super-2 number, since 2×2106431² = 8874103115522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2106437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1053215 + 1053216.

It is an arithmetic number, because the mean of its divisors is an integer number (1053216).

2^2106431 is an apocalyptic number.

2106431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2106431 is an equidigital number, since it uses as much as digits as its factorization.

2106431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2106431 is about 1451.3548842375. The cubic root of 2106431 is about 128.1885039945.

The spelling of 2106431 in words is "two million, one hundred six thousand, four hundred thirty-one".