409237240091 has 4 divisors (see below), whose sum is σ = 414417458400. Its totient is φ = 404057021784.

The previous prime is 409237240081. The next prime is 409237240099. The reversal of 409237240091 is 190042732904.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-409237240091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (409237240099) 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, 2590109036 + ... + 2590109193.

It is an arithmetic number, because the mean of its divisors is an integer number (103604364600).

Almost surely, 2^409237240091 is an apocalyptic number.

409237240091 is a deficient number, since it is larger than the sum of its proper divisors (5180218309).

409237240091 is an equidigital number, since it uses as much as digits as its factorization.

409237240091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5180218308.

The product of its (nonzero) digits is 108864, while the sum is 41.

Adding to 409237240091 its reverse (190042732904), we get a palindrome (599279972995).

The spelling of 409237240091 in words is "four hundred nine billion, two hundred thirty-seven million, two hundred forty thousand, ninety-one".