991754 has 4 divisors (see below), whose sum is σ = 1487634. Its totient is φ = 495876.

The previous prime is 991751. The next prime is 991777. The reversal of 991754 is 457199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 457199 = 73 ⋅6263.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 277729 = 845^2 + 527^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 991754.

It is not an unprimeable number, because it can be changed into a prime (991751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247937 + ... + 247940.

2⁹⁹¹⁷⁵⁴ is an apocalyptic number.

991754 is a deficient number, since it is larger than the sum of its proper divisors (495880).

991754 is a wasteful number, since it uses less digits than its factorization.

991754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495879.

The product of its digits is 11340, while the sum is 35.

The square root of 991754 is about 995.8684652101. The cubic root of 991754 is about 99.7243743362.

The spelling of 991754 in words is "nine hundred ninety-one thousand, seven hundred fifty-four".