991124 has 6 divisors (see below), whose sum is σ = 1734474. Its totient is φ = 495560.

The previous prime is 991091. The next prime is 991127. The reversal of 991124 is 421199.

It can be written as a sum of positive squares in only one way, i.e., 868624 + 122500 = 932^2 + 350^2 .

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 991093 and 991102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123887 + ... + 123894.

It is an arithmetic number, because the mean of its divisors is an integer number (289079).

2⁹⁹¹¹²⁴ is an apocalyptic number.

It is an amenable number.

991124 is a deficient number, since it is larger than the sum of its proper divisors (743350).

991124 is a wasteful number, since it uses less digits than its factorization.

991124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247785 (or 247783 counting only the distinct ones).

The product of its digits is 648, while the sum is 26.

The square root of 991124 is about 995.5521081290. The cubic root of 991124 is about 99.7032536202.

The spelling of 991124 in words is "nine hundred ninety-one thousand, one hundred twenty-four".