991194929 has 2 divisors, whose sum is σ = 991194930. Its totient is φ = 991194928.

The previous prime is 991194829. The next prime is 991194931. The reversal of 991194929 is 929491199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 677196529 + 313998400 = 26023^2 + 17720^2 .

It is a cyclic number.

It is not a de Polignac number, because 991194929 - 2²⁸ = 722759473 is a prime.

Together with 991194931, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (991194989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495597464 + 495597465.

It is an arithmetic number, because the mean of its divisors is an integer number (495597465).

Almost surely, 2^991194929 is an apocalyptic number.

It is an amenable number.

991194929 is a deficient number, since it is larger than the sum of its proper divisors (1).

991194929 is an equidigital number, since it uses as much as digits as its factorization.

991194929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 53.

The square root of 991194929 is about 31483.2483870391. The cubic root of 991194929 is about 997.0563195815.

The spelling of 991194929 in words is "nine hundred ninety-one million, one hundred ninety-four thousand, nine hundred twenty-nine".