398545031 has 2 divisors, whose sum is σ = 398545032. Its totient is φ = 398545030.

The previous prime is 398545003. The next prime is 398545067. The reversal of 398545031 is 130545893.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 398545031 - 2²⁶ = 331436167 is a prime.

It is a super-2 number, since 2×398545031² = 317676283469581922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398542031) 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, 199272515 + 199272516.

It is an arithmetic number, because the mean of its divisors is an integer number (199272516).

Almost surely, 2^398545031 is an apocalyptic number.

398545031 is a deficient number, since it is larger than the sum of its proper divisors (1).

398545031 is an equidigital number, since it uses as much as digits as its factorization.

398545031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 398545031 is about 19963.5926375991. The cubic root of 398545031 is about 735.9118557554.

The spelling of 398545031 in words is "three hundred ninety-eight million, five hundred forty-five thousand, thirty-one".