402241561 has 4 divisors (see below), whose sum is σ = 402732324. Its totient is φ = 401750800.

The previous prime is 402241559. The next prime is 402241597. The reversal of 402241561 is 165142204.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 213014025 + 189227536 = 14595^2 + 13756^2 .

It is a cyclic number.

It is not a de Polignac number, because 402241561 - 2¹ = 402241559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (402241661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244150 + ... + 245791.

It is an arithmetic number, because the mean of its divisors is an integer number (100683081).

Almost surely, 2^402241561 is an apocalyptic number.

It is an amenable number.

402241561 is a deficient number, since it is larger than the sum of its proper divisors (490763).

402241561 is an equidigital number, since it uses as much as digits as its factorization.

402241561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490762.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 402241561 is about 20055.9607349037. The cubic root of 402241561 is about 738.1800669839.

Adding to 402241561 its reverse (165142204), we get a palindrome (567383765).

The spelling of 402241561 in words is "four hundred two million, two hundred forty-one thousand, five hundred sixty-one".