991935747 has 32 divisors (see below), whose sum is σ = 1610300160. Its totient is φ = 598484160.

The previous prime is 991935719. The next prime is 991935751. The reversal of 991935747 is 747539199.

It is a happy number.

It is not a de Polignac number, because 991935747 - 2⁶ = 991935683 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 991935693 and 991935702.

It is not an unprimeable number, because it can be changed into a prime (991935767) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60063 + ... + 74775.

It is an arithmetic number, because the mean of its divisors is an integer number (50321880).

Almost surely, 2^991935747 is an apocalyptic number.

991935747 is a deficient number, since it is larger than the sum of its proper divisors (618364413).

991935747 is a wasteful number, since it uses less digits than its factorization.

991935747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14960 (or 14954 counting only the distinct ones).

The product of its digits is 2143260, while the sum is 54.

The square root of 991935747 is about 31495.0114621348. The cubic root of 991935747 is about 997.3046573216.

The spelling of 991935747 in words is "nine hundred ninety-one million, nine hundred thirty-five thousand, seven hundred forty-seven".