1189640831 has 2 divisors, whose sum is σ = 1189640832. Its totient is φ = 1189640830.

The previous prime is 1189640827. The next prime is 1189640843. The reversal of 1189640831 is 1380469811.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1189640831 - 2² = 1189640827 is a prime.

It is a super-2 number, since 2×1189640831² = 2830490613564741122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1189640801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594820415 + 594820416.

It is an arithmetic number, because the mean of its divisors is an integer number (594820416).

Almost surely, 2^1189640831 is an apocalyptic number.

1189640831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1189640831 is an equidigital number, since it uses as much as digits as its factorization.

1189640831 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 1189640831 is about 34491.1703338695. The cubic root of 1189640831 is about 1059.5918777130.

The spelling of 1189640831 in words is "one billion, one hundred eighty-nine million, six hundred forty thousand, eight hundred thirty-one".