491071945 has 32 divisors (see below), whose sum is σ = 767950848. Its totient is φ = 292543488.

The previous prime is 491071943. The next prime is 491071969. The reversal of 491071945 is 549170194.

It is a cyclic number.

It is not a de Polignac number, because 491071945 - 2¹ = 491071943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 491071898 and 491071907.

It is not an unprimeable number, because it can be changed into a prime (491071943) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24009 + ... + 39478.

It is an arithmetic number, because the mean of its divisors is an integer number (23998464).

Almost surely, 2^491071945 is an apocalyptic number.

It is an amenable number.

491071945 is a deficient number, since it is larger than the sum of its proper divisors (276878903).

491071945 is a wasteful number, since it uses less digits than its factorization.

491071945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63529.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 491071945 is about 22160.1431628950. The cubic root of 491071945 is about 788.9479908295.

The spelling of 491071945 in words is "four hundred ninety-one million, seventy-one thousand, nine hundred forty-five".