991376411 has 2 divisors, whose sum is σ = 991376412. Its totient is φ = 991376410.

The previous prime is 991376389. The next prime is 991376423. The reversal of 991376411 is 114673199.

It is a strong prime.

It is an emirp because it is prime and its reverse (114673199) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-991376411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (991376611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495688205 + 495688206.

It is an arithmetic number, because the mean of its divisors is an integer number (495688206).

Almost surely, 2^991376411 is an apocalyptic number.

991376411 is a deficient number, since it is larger than the sum of its proper divisors (1).

991376411 is an equidigital number, since it uses as much as digits as its factorization.

991376411 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 41.

The square root of 991376411 is about 31486.1304545351. The cubic root of 991376411 is about 997.1171675968.

The spelling of 991376411 in words is "nine hundred ninety-one million, three hundred seventy-six thousand, four hundred eleven".