117447561 has 108 divisors (see below), whose sum is σ = 227066112. Its totient is φ = 58212000.

The previous prime is 117447559. The next prime is 117447563. The reversal of 117447561 is 165744711.

It is an interprime number because it is at equal distance from previous prime (117447559) and next prime (117447563).

It is not a de Polignac number, because 117447561 - 2¹ = 117447559 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117447563) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1654156 + ... + 1654226.

It is an arithmetic number, because the mean of its divisors is an integer number (2102464).

Almost surely, 2^117447561 is an apocalyptic number.

117447561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

117447561 is a deficient number, since it is larger than the sum of its proper divisors (109618551).

117447561 is a wasteful number, since it uses less digits than its factorization.

117447561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144 (or 123 counting only the distinct ones).

The product of its digits is 23520, while the sum is 36.

The square root of 117447561 is about 10837.3225937037. The cubic root of 117447561 is about 489.7201803725.

The spelling of 117447561 in words is "one hundred seventeen million, four hundred forty-seven thousand, five hundred sixty-one".