1020199999949 has 4 divisors (see below), whose sum is σ = 1098676923036. Its totient is φ = 941723076864.

The previous prime is 1020199999939. The next prime is 1020199999963. The reversal of 1020199999949 is 9499999910201.

1020199999949 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 620561091049 + 399638908900 = 787757^2 + 632170^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020199999949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020199999939) 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, 39238461524 + ... + 39238461549.

It is an arithmetic number, because the mean of its divisors is an integer number (274669230759).

Almost surely, 2^{1020199999949} is an apocalyptic number.

It is an amenable number.

1020199999949 is a deficient number, since it is larger than the sum of its proper divisors (78476923087).

1020199999949 is an equidigital number, since it uses as much as digits as its factorization.

1020199999949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78476923086.

The product of its (nonzero) digits is 38263752, while the sum is 71.

The spelling of 1020199999949 in words is "one trillion, twenty billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred forty-nine".