1999453679 has 2 divisors, whose sum is σ = 1999453680. Its totient is φ = 1999453678.

The previous prime is 1999453661. The next prime is 1999453697. The reversal of 1999453679 is 9763549991.

Together with next prime (1999453697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (1999453661) and next prime (1999453697).

It is a cyclic number.

It is not a de Polignac number, because 1999453679 - 2¹⁶ = 1999388143 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999153679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999726839 + 999726840.

It is an arithmetic number, because the mean of its divisors is an integer number (999726840).

Almost surely, 2^1999453679 is an apocalyptic number.

1999453679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999453679 is an equidigital number, since it uses as much as digits as its factorization.

1999453679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16533720, while the sum is 62.

The square root of 1999453679 is about 44715.2510783513. The cubic root of 1999453679 is about 1259.8063192263.

The spelling of 1999453679 in words is "one billion, nine hundred ninety-nine million, four hundred fifty-three thousand, six hundred seventy-nine".