1091780416 has 42 divisors (see below), whose sum is σ = 2185590498. Its totient is φ = 541105920.

The previous prime is 1091780411. The next prime is 1091780467. The reversal of 1091780416 is 6140871901.

It can be written as a sum of positive squares in only one way, i.e., 603193600 + 488586816 = 24560^2 + 22104^2 .

It is a super-2 number, since 2×1091780416² = 2383968953522266112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091780411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3556135 + ... + 3556441.

It is an arithmetic number, because the mean of its divisors is an integer number (52037869).

Almost surely, 2^1091780416 is an apocalyptic number.

1091780416 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1091780416 is an abundant number, since it is smaller than the sum of its proper divisors (1093810082).

1091780416 is an frugal number, since it uses more digits than its factorization.

1091780416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 1091780416 is about 33042.1006596130. The cubic root of 1091780416 is about 1029.7024986771.

The spelling of 1091780416 in words is "one billion, ninety-one million, seven hundred eighty thousand, four hundred sixteen".