491239967 has 4 divisors (see below), whose sum is σ = 493812096. Its totient is φ = 488667840.

The previous prime is 491239951. The next prime is 491239979. The reversal of 491239967 is 769932194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491239967 - 2⁴ = 491239951 is a prime.

It is a super-2 number, since 2×491239967² = 482633410356322178, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491232967) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1285778 + ... + 1286159.

It is an arithmetic number, because the mean of its divisors is an integer number (123453024).

Almost surely, 2^491239967 is an apocalyptic number.

491239967 is a deficient number, since it is larger than the sum of its proper divisors (2572129).

491239967 is a wasteful number, since it uses less digits than its factorization.

491239967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2572128.

The product of its digits is 734832, while the sum is 50.

The square root of 491239967 is about 22163.9339242834. The cubic root of 491239967 is about 789.0379610160.

The spelling of 491239967 in words is "four hundred ninety-one million, two hundred thirty-nine thousand, nine hundred sixty-seven".