40991089 has 4 divisors (see below), whose sum is σ = 41353956. Its totient is φ = 40628224.

The previous prime is 40991087. The next prime is 40991099. The reversal of 40991089 is 98019904.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2053489 + 38937600 = 1433^2 + 6240^2 .

It is a cyclic number.

It is not a de Polignac number, because 40991089 - 2¹ = 40991087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40991087) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 181264 + ... + 181489.

It is an arithmetic number, because the mean of its divisors is an integer number (10338489).

Almost surely, 2^40991089 is an apocalyptic number.

It is an amenable number.

40991089 is a deficient number, since it is larger than the sum of its proper divisors (362867).

40991089 is a wasteful number, since it uses less digits than its factorization.

40991089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362866.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 40991089 is about 6402.4283674243. The cubic root of 40991089 is about 344.7967408755.

The spelling of 40991089 in words is "forty million, nine hundred ninety-one thousand, eighty-nine".