991234313 has 4 divisors (see below), whose sum is σ = 1043404560. Its totient is φ = 939064068.

The previous prime is 991234303. The next prime is 991234421. The reversal of 991234313 is 313432199.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 991234313 - 2¹⁶ = 991168777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (991234303) 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, 26085095 + ... + 26085132.

It is an arithmetic number, because the mean of its divisors is an integer number (260851140).

Almost surely, 2^991234313 is an apocalyptic number.

It is an amenable number.

991234313 is a deficient number, since it is larger than the sum of its proper divisors (52170247).

991234313 is a wasteful number, since it uses less digits than its factorization.

991234313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52170246.

The product of its digits is 17496, while the sum is 35.

The square root of 991234313 is about 31483.8738563094. The cubic root of 991234313 is about 997.0695250385.

The spelling of 991234313 in words is "nine hundred ninety-one million, two hundred thirty-four thousand, three hundred thirteen".