42105031 has 2 divisors, whose sum is σ = 42105032. Its totient is φ = 42105030.

The previous prime is 42104983. The next prime is 42105047. The reversal of 42105031 is 13050124.

It is an a-pointer prime, because the next prime (42105047) can be obtained adding 42105031 to its sum of digits (16).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42105031 - 2⁹ = 42104519 is a prime.

It is a super-2 number, since 2×42105031² = 3545667271021922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42104996 and 42105014.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42105331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21052515 + 21052516.

It is an arithmetic number, because the mean of its divisors is an integer number (21052516).

Almost surely, 2^42105031 is an apocalyptic number.

42105031 is a deficient number, since it is larger than the sum of its proper divisors (1).

42105031 is an equidigital number, since it uses as much as digits as its factorization.

42105031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 42105031 is about 6488.8389562386. The cubic root of 42105031 is about 347.8921776987.

Adding to 42105031 its reverse (13050124), we get a palindrome (55155155).

The spelling of 42105031 in words is "forty-two million, one hundred five thousand, thirty-one".