491711351 has 2 divisors, whose sum is σ = 491711352. Its totient is φ = 491711350.

The previous prime is 491711323. The next prime is 491711377. The reversal of 491711351 is 153117194.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491711351 - 2²² = 487517047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491711851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245855675 + 245855676.

It is an arithmetic number, because the mean of its divisors is an integer number (245855676).

Almost surely, 2^491711351 is an apocalyptic number.

491711351 is a deficient number, since it is larger than the sum of its proper divisors (1).

491711351 is an equidigital number, since it uses as much as digits as its factorization.

491711351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 32.

The square root of 491711351 is about 22174.5654072408. The cubic root of 491711351 is about 789.2902619890.

The spelling of 491711351 in words is "four hundred ninety-one million, seven hundred eleven thousand, three hundred fifty-one".