991361297337 has 4 divisors (see below), whose sum is σ = 1321815063120. Its totient is φ = 660907531556.

The previous prime is 991361297263. The next prime is 991361297371. The reversal of 991361297337 is 733792163199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 991361297337 - 2⁸ = 991361297081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (991361297137) 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, 165226882887 + ... + 165226882892.

It is an arithmetic number, because the mean of its divisors is an integer number (330453765780).

Almost surely, 2^991361297337 is an apocalyptic number.

It is an amenable number.

991361297337 is a deficient number, since it is larger than the sum of its proper divisors (330453765783).

991361297337 is a wasteful number, since it uses less digits than its factorization.

991361297337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330453765782.

The product of its digits is 11573604, while the sum is 60.

The spelling of 991361297337 in words is "nine hundred ninety-one billion, three hundred sixty-one million, two hundred ninety-seven thousand, three hundred thirty-seven".