1117017991 has 2 divisors, whose sum is σ = 1117017992. Its totient is φ = 1117017990.

The previous prime is 1117017943. The next prime is 1117018013. The reversal of 1117017991 is 1997107111.

It is a strong prime.

It is an emirp because it is prime and its reverse (1997107111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1117017991 - 2¹¹ = 1117015943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1117017991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1117017491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 558508995 + 558508996.

It is an arithmetic number, because the mean of its divisors is an integer number (558508996).

Almost surely, 2^1117017991 is an apocalyptic number.

1117017991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1117017991 is an equidigital number, since it uses as much as digits as its factorization.

1117017991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3969, while the sum is 37.

The square root of 1117017991 is about 33421.8190857410. The cubic root of 1117017991 is about 1037.5763306883.

It can be divided in two parts, 11170 and 17991, that added together give a triangular number (29161 = T₂₄₁).

The spelling of 1117017991 in words is "one billion, one hundred seventeen million, seventeen thousand, nine hundred ninety-one".