1678431499 has 4 divisors (see below), whose sum is σ = 1681143640. Its totient is φ = 1675719360.

The previous prime is 1678431493. The next prime is 1678431511. The reversal of 1678431499 is 9941348761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9941348761 = 41 ⋅242471921.

It is a cyclic number.

It is not a de Polignac number, because 1678431499 - 2⁵ = 1678431467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1678431493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1355142 + ... + 1356379.

It is an arithmetic number, because the mean of its divisors is an integer number (420285910).

Almost surely, 2^1678431499 is an apocalyptic number.

1678431499 is a deficient number, since it is larger than the sum of its proper divisors (2712141).

1678431499 is an equidigital number, since it uses as much as digits as its factorization.

1678431499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2712140.

The product of its digits is 1306368, while the sum is 52.

The square root of 1678431499 is about 40968.6648427795. The cubic root of 1678431499 is about 1188.4143131533.

The spelling of 1678431499 in words is "one billion, six hundred seventy-eight million, four hundred thirty-one thousand, four hundred ninety-nine".