117087661 has 2 divisors, whose sum is σ = 117087662. Its totient is φ = 117087660.

The previous prime is 117087643. The next prime is 117087679. The reversal of 117087661 is 166780711.

It is a balanced prime because it is at equal distance from previous prime (117087643) and next prime (117087679).

It can be written as a sum of positive squares in only one way, i.e., 77774761 + 39312900 = 8819^2 + 6270^2 .

It is a cyclic number.

It is not a de Polignac number, because 117087661 - 2⁷ = 117087533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 117087661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117087601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58543830 + 58543831.

It is an arithmetic number, because the mean of its divisors is an integer number (58543831).

Almost surely, 2^117087661 is an apocalyptic number.

It is an amenable number.

117087661 is a deficient number, since it is larger than the sum of its proper divisors (1).

117087661 is an equidigital number, since it uses as much as digits as its factorization.

117087661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 117087661 is about 10820.7051988306. The cubic root of 117087661 is about 489.2194444720.

It can be divided in two parts, 1170 and 87661, that added together give a triangular number (88831 = T₄₂₁).

The spelling of 117087661 in words is "one hundred seventeen million, eighty-seven thousand, six hundred sixty-one".