1091797974 has 64 divisors (see below), whose sum is σ = 2515896000. Its totient is φ = 350959392.

The previous prime is 1091797963. The next prime is 1091797991. The reversal of 1091797974 is 4797971901.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1091797974.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1316592 + ... + 1317420.

It is an arithmetic number, because the mean of its divisors is an integer number (39310875).

Almost surely, 2^1091797974 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1091797974, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1257948000).

1091797974 is an abundant number, since it is smaller than the sum of its proper divisors (1424098026).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1091797974 is an frugal number, since it uses more digits than its factorization.

1091797974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 927 (or 863 counting only the distinct ones).

The product of its (nonzero) digits is 1000188, while the sum is 54.

The square root of 1091797974 is about 33042.3663498848. The cubic root of 1091797974 is about 1029.7080185354.

The spelling of 1091797974 in words is "one billion, ninety-one million, seven hundred ninety-seven thousand, nine hundred seventy-four".