261643322 has 4 divisors (see below), whose sum is σ = 392464986. Its totient is φ = 130821660.

The previous prime is 261643321. The next prime is 261643363. The reversal of 261643322 is 223346162.

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

It can be written as a sum of positive squares in only one way, i.e., 248976841 + 12666481 = 15779^2 + 3559^2 .

It is not an unprimeable number, because it can be changed into a prime (261643321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65410829 + ... + 65410832.

Almost surely, 2^261643322 is an apocalyptic number.

261643322 is a deficient number, since it is larger than the sum of its proper divisors (130821664).

261643322 is a wasteful number, since it uses less digits than its factorization.

261643322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130821663.

The product of its digits is 10368, while the sum is 29.

The square root of 261643322 is about 16175.3924836463. The cubic root of 261643322 is about 639.5922875221.

Adding to 261643322 its reverse (223346162), we get a palindrome (484989484).

The spelling of 261643322 in words is "two hundred sixty-one million, six hundred forty-three thousand, three hundred twenty-two".