1091670472981 has 16 divisors (see below), whose sum is σ = 1211973275520. Its totient is φ = 975027041280.

The previous prime is 1091670472979. The next prime is 1091670472987. The reversal of 1091670472981 is 1892740761901.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1091670472981 - 2¹ = 1091670472979 is a prime.

It is a super-2 number, since 2×1091670472981² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091670472987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3587841 + ... + 3880198.

It is an arithmetic number, because the mean of its divisors is an integer number (75748329720).

Almost surely, 2^{1091670472981} is an apocalyptic number.

1091670472981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1091670472981 is a deficient number, since it is larger than the sum of its proper divisors (120302802539).

1091670472981 is a wasteful number, since it uses less digits than its factorization.

1091670472981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7468284.

The product of its (nonzero) digits is 1524096, while the sum is 55.

It can be divided in two parts, 1091670 and 472981, that added together give a palindrome (1564651).

The spelling of 1091670472981 in words is "one trillion, ninety-one billion, six hundred seventy million, four hundred seventy-two thousand, nine hundred eighty-one".