42331087 has 2 divisors, whose sum is σ = 42331088. Its totient is φ = 42331086.

The previous prime is 42331057. The next prime is 42331099. The reversal of 42331087 is 78013324.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42331087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42331007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21165543 + 21165544.

It is an arithmetic number, because the mean of its divisors is an integer number (21165544).

Almost surely, 2^42331087 is an apocalyptic number.

42331087 is a deficient number, since it is larger than the sum of its proper divisors (1).

42331087 is an equidigital number, since it uses as much as digits as its factorization.

42331087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 42331087 is about 6506.2344716433. The cubic root of 42331087 is about 348.5136615552.

The spelling of 42331087 in words is "forty-two million, three hundred thirty-one thousand, eighty-seven".