261535006 has 4 divisors (see below), whose sum is σ = 392302512. Its totient is φ = 130767502.

The previous prime is 261534991. The next prime is 261535013. The reversal of 261535006 is 600535162.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65383750 + ... + 65383753.

It is an arithmetic number, because the mean of its divisors is an integer number (98075628).

Almost surely, 2^261535006 is an apocalyptic number.

261535006 is a deficient number, since it is larger than the sum of its proper divisors (130767506).

261535006 is a wasteful number, since it uses less digits than its factorization.

261535006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130767505.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 261535006 is about 16172.0439648178. The cubic root of 261535006 is about 639.5040151368.

The spelling of 261535006 in words is "two hundred sixty-one million, five hundred thirty-five thousand, six".