261305006 has 4 divisors (see below), whose sum is σ = 391957512. Its totient is φ = 130652502.

The previous prime is 261304997. The next prime is 261305039. The reversal of 261305006 is 600503162.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65326250 + ... + 65326253.

It is an arithmetic number, because the mean of its divisors is an integer number (97989378).

Almost surely, 2^261305006 is an apocalyptic number.

261305006 is a deficient number, since it is larger than the sum of its proper divisors (130652506).

261305006 is a wasteful number, since it uses less digits than its factorization.

261305006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130652505.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 261305006 is about 16164.9313639124. The cubic root of 261305006 is about 639.3164952279.

Adding to 261305006 its reverse (600503162), we get a palindrome (861808168).

The spelling of 261305006 in words is "two hundred sixty-one million, three hundred five thousand, six".