491011431 has 8 divisors (see below), whose sum is σ = 655970160. Its totient is φ = 326696832.

The previous prime is 491011369. The next prime is 491011447. The reversal of 491011431 is 134110194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 491011431 - 2¹³ = 491003239 is a prime.

It is a super-2 number, since 2×491011431² = 482184450745335522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491010431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159250 + ... + 162303.

It is an arithmetic number, because the mean of its divisors is an integer number (81996270).

Almost surely, 2^491011431 is an apocalyptic number.

491011431 is a deficient number, since it is larger than the sum of its proper divisors (164958729).

491011431 is a wasteful number, since it uses less digits than its factorization.

491011431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322065.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 491011431 is about 22158.7777415633. Note that the first 4 decimals coincide. The cubic root of 491011431 is about 788.9155825708.

The spelling of 491011431 in words is "four hundred ninety-one million, eleven thousand, four hundred thirty-one".