261422506 has 8 divisors (see below), whose sum is σ = 392467680. Its totient is φ = 130599948.

The previous prime is 261422503. The next prime is 261422521. The reversal of 261422506 is 605224162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (261422503) 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, 52686 + ... + 57433.

It is an arithmetic number, because the mean of its divisors is an integer number (49058460).

Almost surely, 2^261422506 is an apocalyptic number.

261422506 is a deficient number, since it is larger than the sum of its proper divisors (131045174).

261422506 is a wasteful number, since it uses less digits than its factorization.

261422506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111308.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 261422506 is about 16168.5653661665. The cubic root of 261422506 is about 639.4123071842.

Adding to 261422506 its reverse (605224162), we get a palindrome (866646668).

The spelling of 261422506 in words is "two hundred sixty-one million, four hundred twenty-two thousand, five hundred six".