991099514951 has 8 divisors (see below), whose sum is σ = 1219814787744. Its totient is φ = 784166649120.

The previous prime is 991099514929. The next prime is 991099514969. The reversal of 991099514951 is 159415990199.

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 991099514951 - 2¹⁰ = 991099513927 is a prime.

It is a super-2 number, since 2×991099514951² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991099514551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5445601640 + ... + 5445601821.

It is an arithmetic number, because the mean of its divisors is an integer number (152476848468).

Almost surely, 2^991099514951 is an apocalyptic number.

991099514951 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

991099514951 is a deficient number, since it is larger than the sum of its proper divisors (228715272793).

991099514951 is a wasteful number, since it uses less digits than its factorization.

991099514951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10891203481.

The product of its (nonzero) digits is 5904900, while the sum is 62.

The spelling of 991099514951 in words is "nine hundred ninety-one billion, ninety-nine million, five hundred fourteen thousand, nine hundred fifty-one".