1141639991 has 2 divisors, whose sum is σ = 1141639992. Its totient is φ = 1141639990.

The previous prime is 1141639987. The next prime is 1141640009. The reversal of 1141639991 is 1999361411.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1141639991 - 2² = 1141639987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1141639901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 570819995 + 570819996.

It is an arithmetic number, because the mean of its divisors is an integer number (570819996).

Almost surely, 2^1141639991 is an apocalyptic number.

1141639991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1141639991 is an equidigital number, since it uses as much as digits as its factorization.

1141639991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52488, while the sum is 44.

The square root of 1141639991 is about 33788.1634748028. The cubic root of 1141639991 is about 1045.1446244132.

The spelling of 1141639991 in words is "one billion, one hundred forty-one million, six hundred thirty-nine thousand, nine hundred ninety-one".