991960369 has 4 divisors (see below), whose sum is σ = 994103296. Its totient is φ = 989817444.

The previous prime is 991960357. The next prime is 991960373. The reversal of 991960369 is 963069199.

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 991960369 - 2⁵ = 991960337 is a prime.

It is a super-2 number, since 2×991960369² = 1967970747333232322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991967369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1070769 + ... + 1071694.

It is an arithmetic number, because the mean of its divisors is an integer number (248525824).

Almost surely, 2^991960369 is an apocalyptic number.

It is an amenable number.

991960369 is a deficient number, since it is larger than the sum of its proper divisors (2142927).

991960369 is a wasteful number, since it uses less digits than its factorization.

991960369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142926.

The product of its (nonzero) digits is 708588, while the sum is 52.

The square root of 991960369 is about 31495.4023470093. The cubic root of 991960369 is about 997.3129090094.

The spelling of 991960369 in words is "nine hundred ninety-one million, nine hundred sixty thousand, three hundred sixty-nine".