143361261 has 6 divisors (see below), whose sum is σ = 207077390. Its totient is φ = 95574168.

The previous prime is 143361241. The next prime is 143361263. The reversal of 143361261 is 162163341.

143361261 is a `hidden beast` number, since 1 + 43 + 3 + 612 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 107433225 + 35928036 = 10365^2 + 5994^2 .

It is not a de Polignac number, because 143361261 - 2¹¹ = 143359213 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143361263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7964506 + ... + 7964523.

Almost surely, 2^143361261 is an apocalyptic number.

It is an amenable number.

143361261 is a deficient number, since it is larger than the sum of its proper divisors (63716129).

143361261 is a wasteful number, since it uses less digits than its factorization.

143361261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15929035 (or 15929032 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 143361261 is about 11973.3562963774. The cubic root of 143361261 is about 523.3721441549.

The spelling of 143361261 in words is "one hundred forty-three million, three hundred sixty-one thousand, two hundred sixty-one".