249366561091 has 4 divisors (see below), whose sum is σ = 249446463784. Its totient is φ = 249286658400.

The previous prime is 249366561053. The next prime is 249366561107. The reversal of 249366561091 is 190165663942.

It is a happy number.

249366561091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 249366561091 - 2¹³ = 249366552899 is a prime.

It is a super-2 number, since 2×249366561091² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249366561011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39946665 + ... + 39952906.

It is an arithmetic number, because the mean of its divisors is an integer number (62361615946).

Almost surely, 2^249366561091 is an apocalyptic number.

249366561091 is a deficient number, since it is larger than the sum of its proper divisors (79902693).

249366561091 is an equidigital number, since it uses as much as digits as its factorization.

249366561091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79902692.

The product of its (nonzero) digits is 2099520, while the sum is 52.

The spelling of 249366561091 in words is "two hundred forty-nine billion, three hundred sixty-six million, five hundred sixty-one thousand, ninety-one".