117561553 has 2 divisors, whose sum is σ = 117561554. Its totient is φ = 117561552.

The previous prime is 117561551. The next prime is 117561557. The reversal of 117561553 is 355165711.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105534529 + 12027024 = 10273^2 + 3468^2 .

It is a cyclic number.

It is not a de Polignac number, because 117561553 - 2¹ = 117561551 is a prime.

Together with 117561551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (117561551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58780776 + 58780777.

It is an arithmetic number, because the mean of its divisors is an integer number (58780777).

Almost surely, 2^117561553 is an apocalyptic number.

It is an amenable number.

117561553 is a deficient number, since it is larger than the sum of its proper divisors (1).

117561553 is an equidigital number, since it uses as much as digits as its factorization.

117561553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15750, while the sum is 34.

The square root of 117561553 is about 10842.5805507730. The cubic root of 117561553 is about 489.8785663265.

The spelling of 117561553 in words is "one hundred seventeen million, five hundred sixty-one thousand, five hundred fifty-three".