9091381 has 16 divisors (see below), whose sum is σ = 10322928. Its totient is φ = 7948800.

The previous prime is 9091373. The next prime is 9091387. The reversal of 9091381 is 1831909.

9091381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1020100 + 8071281 = 1010^2 + 2841^2 .

It is a cyclic number.

It is not a de Polignac number, because 9091381 - 2³ = 9091373 is a prime.

It is a super-2 number, since 2×9091381² = 165306416974322, which 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 (9091387) 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, 19491 + ... + 19951.

It is an arithmetic number, because the mean of its divisors is an integer number (645183).

Almost surely, 2^9091381 is an apocalyptic number.

It is an amenable number.

9091381 is a deficient number, since it is larger than the sum of its proper divisors (1231547).

9091381 is a wasteful number, since it uses less digits than its factorization.

9091381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 9091381 is about 3015.1917020316. The cubic root of 9091381 is about 208.7100134963.

The spelling of 9091381 in words is "nine million, ninety-one thousand, three hundred eighty-one".