116969561 has 4 divisors (see below), whose sum is σ = 117137124. Its totient is φ = 116802000.

The previous prime is 116969551. The next prime is 116969563. The reversal of 116969561 is 165969611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 106729561 + 10240000 = 10331^2 + 3200^2 .

It is a cyclic number.

It is not a de Polignac number, because 116969561 - 2⁶ = 116969497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (116969563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82730 + ... + 84131.

It is an arithmetic number, because the mean of its divisors is an integer number (29284281).

Almost surely, 2^116969561 is an apocalyptic number.

It is an amenable number.

116969561 is a deficient number, since it is larger than the sum of its proper divisors (167563).

116969561 is an equidigital number, since it uses as much as digits as its factorization.

116969561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167562.

The product of its digits is 87480, while the sum is 44.

The square root of 116969561 is about 10815.2466915924. The cubic root of 116969561 is about 489.0549060619.

Subtracting 116969561 from its reverse (165969611), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 116969561 in words is "one hundred sixteen million, nine hundred sixty-nine thousand, five hundred sixty-one".