491386351 has 2 divisors, whose sum is σ = 491386352. Its totient is φ = 491386350.

The previous prime is 491386339. The next prime is 491386367. The reversal of 491386351 is 153683194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491386351 - 2⁷ = 491386223 is a prime.

It is equal to p_25925647 and since 491386351 and 25925647 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491386321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245693175 + 245693176.

It is an arithmetic number, because the mean of its divisors is an integer number (245693176).

Almost surely, 2^491386351 is an apocalyptic number.

491386351 is a deficient number, since it is larger than the sum of its proper divisors (1).

491386351 is an equidigital number, since it uses as much as digits as its factorization.

491386351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 40.

The square root of 491386351 is about 22167.2359801577. The cubic root of 491386351 is about 789.1163280530.

The spelling of 491386351 in words is "four hundred ninety-one million, three hundred eighty-six thousand, three hundred fifty-one".