16420031 has 2 divisors, whose sum is σ = 16420032. Its totient is φ = 16420030.

The previous prime is 16420007. The next prime is 16420043. The reversal of 16420031 is 13002461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16420031 - 2¹⁸ = 16157887 is a prime.

It is a super-2 number, since 2×16420031² = 539234836081922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16419991 and 16420009.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16420051) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8210015 + 8210016.

It is an arithmetic number, because the mean of its divisors is an integer number (8210016).

Almost surely, 2^16420031 is an apocalyptic number.

16420031 is a deficient number, since it is larger than the sum of its proper divisors (1).

16420031 is an equidigital number, since it uses as much as digits as its factorization.

16420031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 16420031 is about 4052.1637429897. The cubic root of 16420031 is about 254.1702157467.

Adding to 16420031 its reverse (13002461), we get a palindrome (29422492).

The spelling of 16420031 in words is "sixteen million, four hundred twenty thousand, thirty-one".