991869862 has 32 divisors (see below), whose sum is σ = 1638247680. Its totient is φ = 448343040.

The previous prime is 991869839. The next prime is 991869877. The reversal of 991869862 is 268968199.

It is a junction number, because it is equal to n+sod(n) for n = 991869797 and 991869806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140964 + ... + 147832.

It is an arithmetic number, because the mean of its divisors is an integer number (51195240).

Almost surely, 2^991869862 is an apocalyptic number.

991869862 is a deficient number, since it is larger than the sum of its proper divisors (646377818).

991869862 is a wasteful number, since it uses less digits than its factorization.

991869862 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7056.

The product of its digits is 3359232, while the sum is 58.

The square root of 991869862 is about 31493.9654854704. The cubic root of 991869862 is about 997.2825762973.

The spelling of 991869862 in words is "nine hundred ninety-one million, eight hundred sixty-nine thousand, eight hundred sixty-two".