491437913 has 2 divisors, whose sum is σ = 491437914. Its totient is φ = 491437912.

The previous prime is 491437901. The next prime is 491437943. The reversal of 491437913 is 319734194.

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., 491420224 + 17689 = 22168^2 + 133^2 .

It is a cyclic number.

It is not a de Polignac number, because 491437913 - 2⁴ = 491437897 is a prime.

It is a super-2 number, since 2×491437913² = 483022444667591138, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (491437943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245718956 + 245718957.

It is an arithmetic number, because the mean of its divisors is an integer number (245718957).

Almost surely, 2^491437913 is an apocalyptic number.

It is an amenable number.

491437913 is a deficient number, since it is larger than the sum of its proper divisors (1).

491437913 is an equidigital number, since it uses as much as digits as its factorization.

491437913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 491437913 is about 22168.3989724112. The cubic root of 491437913 is about 789.1439281908.

The spelling of 491437913 in words is "four hundred ninety-one million, four hundred thirty-seven thousand, nine hundred thirteen".