491111377 has 2 divisors, whose sum is σ = 491111378. Its totient is φ = 491111376.

The previous prime is 491111353. The next prime is 491111431. The reversal of 491111377 is 773111194.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 472801536 + 18309841 = 21744^2 + 4279^2 .

It is a cyclic number.

It is not a de Polignac number, because 491111377 - 2¹¹ = 491109329 is a prime.

It is a super-2 number, since 2×491111377² = 482380769237672258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491211377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245555688 + 245555689.

It is an arithmetic number, because the mean of its divisors is an integer number (245555689).

Almost surely, 2^491111377 is an apocalyptic number.

It is an amenable number.

491111377 is a deficient number, since it is larger than the sum of its proper divisors (1).

491111377 is an equidigital number, since it uses as much as digits as its factorization.

491111377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 34.

The square root of 491111377 is about 22161.0328504788. The cubic root of 491111377 is about 788.9691071953.

The spelling of 491111377 in words is "four hundred ninety-one million, one hundred eleven thousand, three hundred seventy-seven".