991353240401 has 4 divisors (see below), whose sum is σ = 994114670400. Its totient is φ = 988591810404.

The previous prime is 991353240379. The next prime is 991353240419. The reversal of 991353240401 is 104042353199.

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 991353240401 - 2⁶ = 991353240337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991353249401) 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, 1380714461 + ... + 1380715178.

It is an arithmetic number, because the mean of its divisors is an integer number (248528667600).

Almost surely, 2^991353240401 is an apocalyptic number.

It is an amenable number.

991353240401 is a deficient number, since it is larger than the sum of its proper divisors (2761429999).

991353240401 is a wasteful number, since it uses less digits than its factorization.

991353240401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2761429998.

The product of its (nonzero) digits is 116640, while the sum is 41.

The spelling of 991353240401 in words is "nine hundred ninety-one billion, three hundred fifty-three million, two hundred forty thousand, four hundred one".