1198994097869 has 4 divisors (see below), whose sum is σ = 1199012841180. Its totient is φ = 1198975354560.

The previous prime is 1198994097857. The next prime is 1198994097883. The reversal of 1198994097869 is 9687904998911.

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 398350322500 + 800643775369 = 631150^2 + 894787^2 .

It is a cyclic number.

It is not a de Polignac number, because 1198994097869 - 2²⁸ = 1198725662413 is a prime.

It is a super-2 number, since 2×1198994097869² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1198994097793 and 1198994097802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1198994997869) 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, 9275372 + ... + 9403749.

It is an arithmetic number, because the mean of its divisors is an integer number (299753210295).

Almost surely, 2^{1198994097869} is an apocalyptic number.

It is an amenable number.

1198994097869 is a deficient number, since it is larger than the sum of its proper divisors (18743311).

1198994097869 is an equidigital number, since it uses as much as digits as its factorization.

1198994097869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18743310.

The product of its (nonzero) digits is 634894848, while the sum is 80.

The spelling of 1198994097869 in words is "one trillion, one hundred ninety-eight billion, nine hundred ninety-four million, ninety-seven thousand, eight hundred sixty-nine".