991742733 has 6 divisors (see below), whose sum is σ = 1432517294. Its totient is φ = 661161816.

The previous prime is 991742729. The next prime is 991742737. The reversal of 991742733 is 337247199.

It is an interprime number because it is at equal distance from previous prime (991742729) and next prime (991742737).

It can be written as a sum of positive squares in only one way, i.e., 982634409 + 9108324 = 31347^2 + 3018^2 .

It is not a de Polignac number, because 991742733 - 2² = 991742729 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991742737) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 55096810 + ... + 55096827.

Almost surely, 2^991742733 is an apocalyptic number.

It is an amenable number.

991742733 is a deficient number, since it is larger than the sum of its proper divisors (440774561).

991742733 is a wasteful number, since it uses less digits than its factorization.

991742733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110193643 (or 110193640 counting only the distinct ones).

The product of its digits is 285768, while the sum is 45.

The square root of 991742733 is about 31491.9471135082. The cubic root of 991742733 is about 997.2399668924.

It can be divided in two parts, 9917 and 42733, that added together give a triangular number (52650 = T₃₂₄).

The spelling of 991742733 in words is "nine hundred ninety-one million, seven hundred forty-two thousand, seven hundred thirty-three".