42250031 has 2 divisors, whose sum is σ = 42250032. Its totient is φ = 42250030.

The previous prime is 42250009. The next prime is 42250051. The reversal of 42250031 is 13005224.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42250031 - 2¹⁸ = 41987887 is a prime.

It is a super-2 number, since 2×42250031² = 3570130239001922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 42249991 and 42250009.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42250051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21125015 + 21125016.

It is an arithmetic number, because the mean of its divisors is an integer number (21125016).

Almost surely, 2^42250031 is an apocalyptic number.

42250031 is a deficient number, since it is larger than the sum of its proper divisors (1).

42250031 is an equidigital number, since it uses as much as digits as its factorization.

42250031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 42250031 is about 6500.0023846149. The cubic root of 42250031 is about 348.2910735777.

Adding to 42250031 its reverse (13005224), we get a palindrome (55255255).

The spelling of 42250031 in words is "forty-two million, two hundred fifty thousand, thirty-one".