1091391901047 has 240 divisors, whose sum is σ = 2033690250240. Its totient is φ = 579543164928.

The previous prime is 1091391901037. The next prime is 1091391901073. The reversal of 1091391901047 is 7401091931901.

It is not a de Polignac number, because 1091391901047 - 2¹⁸ = 1091391638903 is a prime.

It is a super-2 number, since 2×1091391901047² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1091391900993 and 1091391901011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091391901027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 2849587018 + ... + 2849587400.

It is an arithmetic number, because the mean of its divisors is an integer number (8473709376).

Almost surely, 2^{1091391901047} is an apocalyptic number.

1091391901047 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

1091391901047 is a deficient number, since it is larger than the sum of its proper divisors (942298349193).

1091391901047 is a wasteful number, since it uses less digits than its factorization.

1091391901047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 852 (or 836 counting only the distinct ones).

The product of its (nonzero) digits is 61236, while the sum is 45.

The spelling of 1091391901047 in words is "one trillion, ninety-one billion, three hundred ninety-one million, nine hundred one thousand, forty-seven".