42009105631 has 2 divisors, whose sum is σ = 42009105632. Its totient is φ = 42009105630.

The previous prime is 42009105599. The next prime is 42009105689. The reversal of 42009105631 is 13650190024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42009105631 - 2⁵ = 42009105599 is a prime.

It is a super-2 number, since 2×42009105631² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 42009105593 and 42009105602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42009105731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21004552815 + 21004552816.

It is an arithmetic number, because the mean of its divisors is an integer number (21004552816).

Almost surely, 2^42009105631 is an apocalyptic number.

42009105631 is a deficient number, since it is larger than the sum of its proper divisors (1).

42009105631 is an equidigital number, since it uses as much as digits as its factorization.

42009105631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

Adding to 42009105631 its reverse (13650190024), we get a palindrome (55659295655).

The spelling of 42009105631 in words is "forty-two billion, nine million, one hundred five thousand, six hundred thirty-one".