261612169 has 16 divisors (see below), whose sum is σ = 323908480. Its totient is φ = 206977680.

The previous prime is 261612107. The next prime is 261612191. The reversal of 261612169 is 961216162.

It is not a de Polignac number, because 261612169 - 2⁷ = 261612041 is a prime.

It is a super-2 number, since 2×261612169² = 136881853937769122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261612569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6874 + ... + 23884.

It is an arithmetic number, because the mean of its divisors is an integer number (20244280).

Almost surely, 2^261612169 is an apocalyptic number.

It is an amenable number.

261612169 is a deficient number, since it is larger than the sum of its proper divisors (62296311).

261612169 is an equidigital number, since it uses as much as digits as its factorization.

261612169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17057 (or 17031 counting only the distinct ones).

The product of its digits is 7776, while the sum is 34.

The square root of 261612169 is about 16174.4294798920. The cubic root of 261612169 is about 639.5669018059.

The spelling of 261612169 in words is "two hundred sixty-one million, six hundred twelve thousand, one hundred sixty-nine".