491849887 has 2 divisors, whose sum is σ = 491849888. Its totient is φ = 491849886.

The previous prime is 491849879. The next prime is 491849923. The reversal of 491849887 is 788948194.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 491849887 - 2³ = 491849879 is a prime.

It is a super-2 number, since 2×491849887² = 483832622683825538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491849807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245924943 + 245924944.

It is an arithmetic number, because the mean of its divisors is an integer number (245924944).

Almost surely, 2^491849887 is an apocalyptic number.

491849887 is a deficient number, since it is larger than the sum of its proper divisors (1).

491849887 is an equidigital number, since it uses as much as digits as its factorization.

491849887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 58.

The square root of 491849887 is about 22177.6889463262. The cubic root of 491849887 is about 789.3643805737.

The spelling of 491849887 in words is "four hundred ninety-one million, eight hundred forty-nine thousand, eight hundred eighty-seven".