1198040731491 has 8 divisors (see below), whose sum is σ = 1600195003920. Its totient is φ = 797290140032.

The previous prime is 1198040731487. The next prime is 1198040731577. The reversal of 1198040731491 is 1941370408911.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1198040731491 - 2² = 1198040731487 is a prime.

It is a super-2 number, since 2×1198040731491² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1198040731491.

It is not an unprimeable number, because it can be changed into a prime (1198040731091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350918250 + ... + 350921663.

It is an arithmetic number, because the mean of its divisors is an integer number (200024375490).

Almost surely, 2^{1198040731491} is an apocalyptic number.

1198040731491 is a deficient number, since it is larger than the sum of its proper divisors (402154272429).

1198040731491 is an equidigital number, since it uses as much as digits as its factorization.

1198040731491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701840485.

The product of its (nonzero) digits is 217728, while the sum is 48.

The spelling of 1198040731491 in words is "one trillion, one hundred ninety-eight billion, forty million, seven hundred thirty-one thousand, four hundred ninety-one".