1691247117 has 16 divisors (see below), whose sum is σ = 2584576512. Its totient is φ = 963637680.

The previous prime is 1691247083. The next prime is 1691247163. The reversal of 1691247117 is 7117421961.

It is a happy number.

It is not a de Polignac number, because 1691247117 - 2¹⁶ = 1691181581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1691247197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108759 + ... + 123332.

It is an arithmetic number, because the mean of its divisors is an integer number (161536032).

Almost surely, 2^1691247117 is an apocalyptic number.

It is an amenable number.

1691247117 is a deficient number, since it is larger than the sum of its proper divisors (893329395).

1691247117 is a wasteful number, since it uses less digits than its factorization.

1691247117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232448.

The product of its digits is 21168, while the sum is 39.

The square root of 1691247117 is about 41124.7749781078. The cubic root of 1691247117 is about 1191.4313490089.

The spelling of 1691247117 in words is "one billion, six hundred ninety-one million, two hundred forty-seven thousand, one hundred seventeen".