1671390499 has 4 divisors (see below), whose sum is σ = 1759358440. Its totient is φ = 1583422560.

The previous prime is 1671390493. The next prime is 1671390503. The reversal of 1671390499 is 9940931761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9940931761 = 14149 ⋅702589.

It is a cyclic number.

It is not a de Polignac number, because 1671390499 - 2⁹ = 1671389987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1671390493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43983942 + ... + 43983979.

It is an arithmetic number, because the mean of its divisors is an integer number (439839610).

Almost surely, 2^1671390499 is an apocalyptic number.

1671390499 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1671390499 is a deficient number, since it is larger than the sum of its proper divisors (87967941).

1671390499 is an equidigital number, since it uses as much as digits as its factorization.

1671390499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87967940.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 1671390499 is about 40882.6430040916. The cubic root of 1671390499 is about 1186.7501893915.

The spelling of 1671390499 in words is "one billion, six hundred seventy-one million, three hundred ninety thousand, four hundred ninety-nine".