1193947891 has 2 divisors, whose sum is σ = 1193947892. Its totient is φ = 1193947890.

The previous prime is 1193947883. The next prime is 1193947901. The reversal of 1193947891 is 1987493911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1193947891 - 2³ = 1193947883 is a prime.

It is not a weakly prime, because it can be changed into another prime (1193947831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 596973945 + 596973946.

It is an arithmetic number, because the mean of its divisors is an integer number (596973946).

Almost surely, 2^1193947891 is an apocalyptic number.

1193947891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1193947891 is an equidigital number, since it uses as much as digits as its factorization.

1193947891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 52.

The square root of 1193947891 is about 34553.5510620833. The cubic root of 1193947891 is about 1060.8690781120.

The spelling of 1193947891 in words is "one billion, one hundred ninety-three million, nine hundred forty-seven thousand, eight hundred ninety-one".