261522242 has 4 divisors (see below), whose sum is σ = 392283366. Its totient is φ = 130761120.

The previous prime is 261522227. The next prime is 261522269. The reversal of 261522242 is 242225162.

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., 168766081 + 92756161 = 12991^2 + 9631^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65380559 + ... + 65380562.

Almost surely, 2^261522242 is an apocalyptic number.

261522242 is a deficient number, since it is larger than the sum of its proper divisors (130761124).

261522242 is a wasteful number, since it uses less digits than its factorization.

261522242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130761123.

The product of its digits is 3840, while the sum is 26.

The square root of 261522242 is about 16171.6493283771. The cubic root of 261522242 is about 639.4936114791.

The spelling of 261522242 in words is "two hundred sixty-one million, five hundred twenty-two thousand, two hundred forty-two".