312686491 has 16 divisors (see below), whose sum is σ = 368057088. Its totient is φ = 262886400.

The previous prime is 312686467. The next prime is 312686501. The reversal of 312686491 is 194686213.

It is a cyclic number.

It is not a de Polignac number, because 312686491 - 2⁹ = 312685979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (312686431) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15970 + ... + 29671.

It is an arithmetic number, because the mean of its divisors is an integer number (23003568).

Almost surely, 2^312686491 is an apocalyptic number.

312686491 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

312686491 is a deficient number, since it is larger than the sum of its proper divisors (55370597).

312686491 is a wasteful number, since it uses less digits than its factorization.

312686491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45702.

The product of its digits is 62208, while the sum is 40.

The square root of 312686491 is about 17682.9435049711. The cubic root of 312686491 is about 678.7393678263.

The spelling of 312686491 in words is "three hundred twelve million, six hundred eighty-six thousand, four hundred ninety-one".