261606315 has 8 divisors (see below), whose sum is σ = 418570128. Its totient is φ = 139523360.

The previous prime is 261606313. The next prime is 261606337. The reversal of 261606315 is 513606162.

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

It is not a de Polignac number, because 261606315 - 2¹ = 261606313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261606311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8720196 + ... + 8720225.

It is an arithmetic number, because the mean of its divisors is an integer number (52321266).

Almost surely, 2^261606315 is an apocalyptic number.

261606315 is a deficient number, since it is larger than the sum of its proper divisors (156963813).

261606315 is a wasteful number, since it uses less digits than its factorization.

261606315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17440429.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 261606315 is about 16174.2485142278. The cubic root of 261606315 is about 639.5621313186.

The spelling of 261606315 in words is "two hundred sixty-one million, six hundred six thousand, three hundred fifteen".