394105531 has 2 divisors, whose sum is σ = 394105532. Its totient is φ = 394105530.

The previous prime is 394105507. The next prime is 394105541. The reversal of 394105531 is 135501493.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 394105531 - 2¹¹ = 394103483 is a prime.

It is a super-2 number, since 2×394105531² = 310638339129583922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 394105493 and 394105502.

It is not a weakly prime, because it can be changed into another prime (394105541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197052765 + 197052766.

It is an arithmetic number, because the mean of its divisors is an integer number (197052766).

Almost surely, 2^394105531 is an apocalyptic number.

394105531 is a deficient number, since it is larger than the sum of its proper divisors (1).

394105531 is an equidigital number, since it uses as much as digits as its factorization.

394105531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 394105531 is about 19852.0913507872. The cubic root of 394105531 is about 733.1691399386.

The spelling of 394105531 in words is "three hundred ninety-four million, one hundred five thousand, five hundred thirty-one".