117729581 has 2 divisors, whose sum is σ = 117729582. Its totient is φ = 117729580.

The previous prime is 117729559. The next prime is 117729593. The reversal of 117729581 is 185927711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117375556 + 354025 = 10834^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 117729581 - 2⁶ = 117729517 is a prime.

It is a super-2 number, since 2×117729581² = 27720508484871122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117729511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58864790 + 58864791.

It is an arithmetic number, because the mean of its divisors is an integer number (58864791).

Almost surely, 2^117729581 is an apocalyptic number.

It is an amenable number.

117729581 is a deficient number, since it is larger than the sum of its proper divisors (1).

117729581 is an equidigital number, since it uses as much as digits as its factorization.

117729581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35280, while the sum is 41.

The square root of 117729581 is about 10850.3263084573. The cubic root of 117729581 is about 490.1118459109. Note that the first 3 decimals are identical.

The spelling of 117729581 in words is "one hundred seventeen million, seven hundred twenty-nine thousand, five hundred eighty-one".