1140235991 has 2 divisors, whose sum is σ = 1140235992. Its totient is φ = 1140235990.

The previous prime is 1140235981. The next prime is 1140236021. The reversal of 1140235991 is 1995320411.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1140235991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1140235981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 570117995 + 570117996.

It is an arithmetic number, because the mean of its divisors is an integer number (570117996).

Almost surely, 2^1140235991 is an apocalyptic number.

1140235991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1140235991 is an equidigital number, since it uses as much as digits as its factorization.

1140235991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 1140235991 is about 33767.3805765268. The cubic root of 1140235991 is about 1044.7160056398.

The spelling of 1140235991 in words is "one billion, one hundred forty million, two hundred thirty-five thousand, nine hundred ninety-one".