1991412942 has 8 divisors (see below), whose sum is σ = 3982825896. Its totient is φ = 663804312.

The previous prime is 1991412931. The next prime is 1991412953. The reversal of 1991412942 is 2492141991.

It is an interprime number because it is at equal distance from previous prime (1991412931) and next prime (1991412953).

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

1991412942 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 1991412894 and 1991412903.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 165951073 + ... + 165951084.

It is an arithmetic number, because the mean of its divisors is an integer number (497853237).

Almost surely, 2^1991412942 is an apocalyptic number.

1991412942 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1991412942 is a wasteful number, since it uses less digits than its factorization.

1991412942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331902162.

The product of its digits is 46656, while the sum is 42.

The square root of 1991412942 is about 44625.2500497196. The cubic root of 1991412942 is about 1258.1152938800.

It can be divided in two parts, 199 and 1412942, that added together give a palindrome (1413141).

The spelling of 1991412942 in words is "one billion, nine hundred ninety-one million, four hundred twelve thousand, nine hundred forty-two".