42756331 has 2 divisors, whose sum is σ = 42756332. Its totient is φ = 42756330.

The previous prime is 42756313. The next prime is 42756341. The reversal of 42756331 is 13365724.

42756331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (42756313) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42756331 - 2⁹ = 42755819 is a prime.

It is a super-2 number, since 2×42756331² = 3656207681163122, which contains 22 as substring.

It is equal to p_2590735 and since 42756331 and 2590735 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 42756293 and 42756302.

It is not a weakly prime, because it can be changed into another prime (42756341) 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, 21378165 + 21378166.

It is an arithmetic number, because the mean of its divisors is an integer number (21378166).

Almost surely, 2^42756331 is an apocalyptic number.

42756331 is a deficient number, since it is larger than the sum of its proper divisors (1).

42756331 is an equidigital number, since it uses as much as digits as its factorization.

42756331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 31.

The square root of 42756331 is about 6538.8325410581. The cubic root of 42756331 is about 349.6767927829.

The spelling of 42756331 in words is "forty-two million, seven hundred fifty-six thousand, three hundred thirty-one".