991740311 has 4 divisors (see below), whose sum is σ = 1001559624. Its totient is φ = 981921000.

The previous prime is 991740287. The next prime is 991740331. The reversal of 991740311 is 113047199.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113047199 = 4549 ⋅24851.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991740311 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 (991740331) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4909505 + ... + 4909706.

It is an arithmetic number, because the mean of its divisors is an integer number (250389906).

Almost surely, 2^991740311 is an apocalyptic number.

991740311 is a deficient number, since it is larger than the sum of its proper divisors (9819313).

991740311 is a wasteful number, since it uses less digits than its factorization.

991740311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9819312.

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 991740311 is about 31491.9086592096. The cubic root of 991740311 is about 997.2391550833.

The spelling of 991740311 in words is "nine hundred ninety-one million, seven hundred forty thousand, three hundred eleven".