1091261420 has 24 divisors (see below), whose sum is σ = 2292273648. Its totient is φ = 436385600.

The previous prime is 1091261417. The next prime is 1091261441. The reversal of 1091261420 is 241621901.

It is a self number, because there is not a number n which added to its sum of digits gives 1091261420.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127475 + ... + 135765.

It is an arithmetic number, because the mean of its divisors is an integer number (95511402).

Almost surely, 2^1091261420 is an apocalyptic number.

1091261420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1091261420 is an abundant number, since it is smaller than the sum of its proper divisors (1201012228).

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

1091261420 is a wasteful number, since it uses less digits than its factorization.

1091261420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14881 (or 14879 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1091261420 is about 33034.2461696949. The cubic root of 1091261420 is about 1029.5393107402.

The spelling of 1091261420 in words is "one billion, ninety-one million, two hundred sixty-one thousand, four hundred twenty".