99105400991 has 8 divisors (see below), whose sum is σ = 101738460864. Its totient is φ = 96494192640.

The previous prime is 99105400943. The next prime is 99105400993. The reversal of 99105400991 is 19900450199.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99105400991 - 2¹⁴ = 99105384607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99105400993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5453690 + ... + 5471831.

It is an arithmetic number, because the mean of its divisors is an integer number (12717307608).

Almost surely, 2^99105400991 is an apocalyptic number.

99105400991 is a deficient number, since it is larger than the sum of its proper divisors (2633059873).

99105400991 is a wasteful number, since it uses less digits than its factorization.

99105400991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10925761.

The product of its (nonzero) digits is 131220, while the sum is 47.

The spelling of 99105400991 in words is "ninety-nine billion, one hundred five million, four hundred thousand, nine hundred ninety-one".