394531031 has 2 divisors, whose sum is σ = 394531032. Its totient is φ = 394531030.

The previous prime is 394531003. The next prime is 394531073. The reversal of 394531031 is 130135493.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 394531031 - 2¹⁴ = 394514647 is a prime.

It is a super-2 number, since 2×394531031² = 311309468843845922, 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 = 394530985 and 394531003.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394531001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197265515 + 197265516.

It is an arithmetic number, because the mean of its divisors is an integer number (197265516).

Almost surely, 2^394531031 is an apocalyptic number.

394531031 is a deficient number, since it is larger than the sum of its proper divisors (1).

394531031 is an equidigital number, since it uses as much as digits as its factorization.

394531031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 394531031 is about 19862.8052147727. The cubic root of 394531031 is about 733.4329028484.

The spelling of 394531031 in words is "three hundred ninety-four million, five hundred thirty-one thousand, thirty-one".