491641499 has 2 divisors, whose sum is σ = 491641500. Its totient is φ = 491641498.

The previous prime is 491641477. The next prime is 491641519. The reversal of 491641499 is 994146194.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 491641499 - 2¹² = 491637403 is a prime.

It is a super-2 number, since 2×491641499² = 483422727077934002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (491641099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245820749 + 245820750.

It is an arithmetic number, because the mean of its divisors is an integer number (245820750).

Almost surely, 2^491641499 is an apocalyptic number.

491641499 is a deficient number, since it is larger than the sum of its proper divisors (1).

491641499 is an equidigital number, since it uses as much as digits as its factorization.

491641499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 491641499 is about 22172.9903035202. The cubic root of 491641499 is about 789.2528849695.

The spelling of 491641499 in words is "four hundred ninety-one million, six hundred forty-one thousand, four hundred ninety-nine".