2145631 has 2 divisors, whose sum is σ = 2145632. Its totient is φ = 2145630.

The previous prime is 2145629. The next prime is 2145641. The reversal of 2145631 is 1365412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2145631 - 2¹ = 2145629 is a prime.

It is a super-2 number, since 2×2145631² = 9207464776322, which contains 22 as substring.

Together with 2145629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072815 + 1072816.

It is an arithmetic number, because the mean of its divisors is an integer number (1072816).

2^2145631 is an apocalyptic number.

2145631 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145631 is an equidigital number, since it uses as much as digits as its factorization.

2145631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 2145631 is about 1464.7972555955. The cubic root of 2145631 is about 128.9788038808.

The spelling of 2145631 in words is "two million, one hundred forty-five thousand, six hundred thirty-one".