991612 has 12 divisors (see below), whose sum is σ = 1747480. Its totient is φ = 492336.

The previous prime is 991607. The next prime is 991619. The reversal of 991612 is 216199.

It is a plaindrome in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991619) by changing a digit.

991612 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162 + ... + 1417.

2⁹⁹¹⁶¹² is an apocalyptic number.

It is an amenable number.

991612 is a deficient number, since it is larger than the sum of its proper divisors (755868).

991612 is a wasteful number, since it uses less digits than its factorization.

991612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1740 (or 1738 counting only the distinct ones).

The product of its digits is 972, while the sum is 28.

The square root of 991612 is about 995.7971681020. The cubic root of 991612 is about 99.7196145749.

It can be divided in two parts, 99 and 1612, that added together give a triangular number (1711 = T₅₈).

The spelling of 991612 in words is "nine hundred ninety-one thousand, six hundred twelve".