42646031 has 2 divisors, whose sum is σ = 42646032. Its totient is φ = 42646030.

The previous prime is 42646003. The next prime is 42646033. The reversal of 42646031 is 13064624.

42646031 is digitally balanced in base 2, 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 a de Polignac number, because none of the positive numbers 2^k-42646031 is a prime.

It is a super-2 number, since 2×42646031² = 3637367920105922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 42646033, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42646033) 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, 21323015 + 21323016.

It is an arithmetic number, because the mean of its divisors is an integer number (21323016).

Almost surely, 2^42646031 is an apocalyptic number.

42646031 is a deficient number, since it is larger than the sum of its proper divisors (1).

42646031 is an equidigital number, since it uses as much as digits as its factorization.

42646031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 42646031 is about 6530.3928672018. The cubic root of 42646031 is about 349.3758426999.

The spelling of 42646031 in words is "forty-two million, six hundred forty-six thousand, thirty-one".