402143561 has 4 divisors (see below), whose sum is σ = 402192000. Its totient is φ = 402095124.

The previous prime is 402143527. The next prime is 402143593. The reversal of 402143561 is 165341204.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 402143561 - 2¹⁰ = 402142537 is a prime.

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 402143561.

It is not an unprimeable number, because it can be changed into a prime (402143461) 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, 8261 + ... + 29538.

It is an arithmetic number, because the mean of its divisors is an integer number (100548000).

Almost surely, 2^402143561 is an apocalyptic number.

It is an amenable number.

402143561 is a deficient number, since it is larger than the sum of its proper divisors (48439).

402143561 is a wasteful number, since it uses less digits than its factorization.

402143561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48438.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 402143561 is about 20053.5174221382. The cubic root of 402143561 is about 738.1201133563.

Adding to 402143561 its reverse (165341204), we get a palindrome (567484765).

The spelling of 402143561 in words is "four hundred two million, one hundred forty-three thousand, five hundred sixty-one".