1047115991 has 2 divisors, whose sum is σ = 1047115992. Its totient is φ = 1047115990.

The previous prime is 1047115987. The next prime is 1047116029. The reversal of 1047115991 is 1995117401.

It is an a-pointer prime, because the next prime (1047116029) can be obtained adding 1047115991 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1047115991 - 2² = 1047115987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1047115921) 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, 523557995 + 523557996.

It is an arithmetic number, because the mean of its divisors is an integer number (523557996).

Almost surely, 2^1047115991 is an apocalyptic number.

1047115991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1047115991 is an equidigital number, since it uses as much as digits as its factorization.

1047115991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 38.

The square root of 1047115991 is about 32359.1716673959. The cubic root of 1047115991 is about 1015.4649332859.

It can be divided in two parts, 10471 and 15991, that added together give a palindrome (26462).

The spelling of 1047115991 in words is "one billion, forty-seven million, one hundred fifteen thousand, nine hundred ninety-one".