143256961 has 3 divisors (see below), whose sum is σ = 143268931. Its totient is φ = 143244992.

The previous prime is 143256917. The next prime is 143256989. The reversal of 143256961 is 169652341.

The square root of 143256961 is 11969.

It is a perfect power (a square), and thus also a powerful number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 169652341 = 8831 ⋅19211.

It can be written as a sum of positive squares in only one way, i.e., 12383361 + 130873600 = 3519^2 + 11440^2 .

It is not a de Polignac number, because 143256961 - 2¹³ = 143248769 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 143256961.

It is not an unprimeable number, because it can be changed into a prime (143256901) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5985 + ... + 17953.

Almost surely, 2^143256961 is an apocalyptic number.

143256961 is the 11969-th square number.

143256961 is the 5985-th centered octagonal number.

It is an amenable number.

143256961 is a deficient number, since it is larger than the sum of its proper divisors (11970).

143256961 is an frugal number, since it uses more digits than its factorization.

143256961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23938 (or 11969 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The cubic root of 143256961 is about 523.2451899189.

The spelling of 143256961 in words is "one hundred forty-three million, two hundred fifty-six thousand, nine hundred sixty-one".