491385031 has 2 divisors, whose sum is σ = 491385032. Its totient is φ = 491385030.

The previous prime is 491385023. The next prime is 491385067. The reversal of 491385031 is 130583194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491385031 - 2³ = 491385023 is a prime.

It is a super-2 number, since 2×491385031² = 482918497381741922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491385001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245692515 + 245692516.

It is an arithmetic number, because the mean of its divisors is an integer number (245692516).

Almost surely, 2^491385031 is an apocalyptic number.

491385031 is a deficient number, since it is larger than the sum of its proper divisors (1).

491385031 is an equidigital number, since it uses as much as digits as its factorization.

491385031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 491385031 is about 22167.2062064663. The cubic root of 491385031 is about 789.1156214573.

The spelling of 491385031 in words is "four hundred ninety-one million, three hundred eighty-five thousand, thirty-one".