1646542379 has 2 divisors, whose sum is σ = 1646542380. Its totient is φ = 1646542378.

The previous prime is 1646542343. The next prime is 1646542511. The reversal of 1646542379 is 9732456461.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1646542379 is a prime.

It is a super-2 number, since 2×1646542379² = 5422203611685959282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1646542319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 823271189 + 823271190.

It is an arithmetic number, because the mean of its divisors is an integer number (823271190).

Almost surely, 2^1646542379 is an apocalyptic number.

1646542379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646542379 is an equidigital number, since it uses as much as digits as its factorization.

1646542379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 47.

The square root of 1646542379 is about 40577.6093307627. The cubic root of 1646542379 is about 1180.8397687348.

The spelling of 1646542379 in words is "one billion, six hundred forty-six million, five hundred forty-two thousand, three hundred seventy-nine".