1019734639549 has 2 divisors, whose sum is σ = 1019734639550. Its totient is φ = 1019734639548.

The previous prime is 1019734639543. The next prime is 1019734639589. The reversal of 1019734639549 is 9459364379101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1009964700900 + 9769938649 = 1004970^2 + 98843^2 .

It is a cyclic number.

It is not a de Polignac number, because 1019734639549 - 2³ = 1019734639541 is a prime.

It is a super-2 number, since 2×1019734639549² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1019734639541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509867319774 + 509867319775.

It is an arithmetic number, because the mean of its divisors is an integer number (509867319775).

Almost surely, 2^{1019734639549} is an apocalyptic number.

It is an amenable number.

1019734639549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1019734639549 is an equidigital number, since it uses as much as digits as its factorization.

1019734639549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22044960, while the sum is 61.

The spelling of 1019734639549 in words is "one trillion, nineteen billion, seven hundred thirty-four million, six hundred thirty-nine thousand, five hundred forty-nine".