1679021497 has 4 divisors (see below), whose sum is σ = 1736918820. Its totient is φ = 1621124176.

The previous prime is 1679021489. The next prime is 1679021537. The reversal of 1679021497 is 7941209761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7941209761 = 13217 ⋅600833.

It can be written as a sum of positive squares in 2 ways, for example, as 964475136 + 714546361 = 31056^2 + 26731^2 .

It is a cyclic number.

It is not a de Polignac number, because 1679021497 - 2³ = 1679021489 is a prime.

It is a super-3 number, since 3×1679021497³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1679021417) 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, 28948618 + ... + 28948675.

It is an arithmetic number, because the mean of its divisors is an integer number (434229705).

Almost surely, 2^1679021497 is an apocalyptic number.

It is an amenable number.

1679021497 is a deficient number, since it is larger than the sum of its proper divisors (57897323).

1679021497 is an equidigital number, since it uses as much as digits as its factorization.

1679021497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57897322.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 1679021497 is about 40975.8648108859. The cubic root of 1679021497 is about 1188.5535463059.

The spelling of 1679021497 in words is "one billion, six hundred seventy-nine million, twenty-one thousand, four hundred ninety-seven".