991367063 has 4 divisors (see below), whose sum is σ = 1001587440. Its totient is φ = 981146688.

The previous prime is 991367033. The next prime is 991367071. The reversal of 991367063 is 360763199.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 991367063 - 2²⁰ = 990318487 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 (991367033) 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, 5110043 + ... + 5110236.

It is an arithmetic number, because the mean of its divisors is an integer number (250396860).

Almost surely, 2^991367063 is an apocalyptic number.

991367063 is a deficient number, since it is larger than the sum of its proper divisors (10220377).

991367063 is a wasteful number, since it uses less digits than its factorization.

991367063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10220376.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 991367063 is about 31485.9820078714. The cubic root of 991367063 is about 997.1140335432.

The spelling of 991367063 in words is "nine hundred ninety-one million, three hundred sixty-seven thousand, sixty-three".