491071969 has 2 divisors, whose sum is σ = 491071970. Its totient is φ = 491071968.

The previous prime is 491071943. The next prime is 491072009. The reversal of 491071969 is 969170194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 474368400 + 16703569 = 21780^2 + 4087^2 .

It is a cyclic number.

It is not a de Polignac number, because 491071969 - 2⁹ = 491071457 is a prime.

It is a super-2 number, since 2×491071969² = 482303357475073922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491071939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245535984 + 245535985.

It is an arithmetic number, because the mean of its divisors is an integer number (245535985).

Almost surely, 2^491071969 is an apocalyptic number.

It is an amenable number.

491071969 is a deficient number, since it is larger than the sum of its proper divisors (1).

491071969 is an equidigital number, since it uses as much as digits as its factorization.

491071969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 491071969 is about 22160.1437044077. The cubic root of 491071969 is about 788.9480036822.

It can be divided in two parts, 49107 and 1969, that added together give a square (51076 = 226²).

The spelling of 491071969 in words is "four hundred ninety-one million, seventy-one thousand, nine hundred sixty-nine".