143461561 has 4 divisors (see below), whose sum is σ = 143485732. Its totient is φ = 143437392.

The previous prime is 143461559. The next prime is 143461573. The reversal of 143461561 is 165164341.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 132963961 + 10497600 = 11531^2 + 3240^2 .

It is a cyclic number.

It is not a de Polignac number, because 143461561 - 2¹ = 143461559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143461541) 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, 3631 + ... + 17323.

It is an arithmetic number, because the mean of its divisors is an integer number (35871433).

Almost surely, 2^143461561 is an apocalyptic number.

It is an amenable number.

143461561 is a deficient number, since it is larger than the sum of its proper divisors (24171).

143461561 is a wasteful number, since it uses less digits than its factorization.

143461561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24170.

The product of its digits is 8640, while the sum is 31.

The square root of 143461561 is about 11977.5440303929. The cubic root of 143461561 is about 523.4941715149.

The spelling of 143461561 in words is "one hundred forty-three million, four hundred sixty-one thousand, five hundred sixty-one".