261587206 has 4 divisors (see below), whose sum is σ = 392380812. Its totient is φ = 130793602.

The previous prime is 261587201. The next prime is 261587233. The reversal of 261587206 is 602785162.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261587201) by changing a digit.

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, 65396800 + ... + 65396803.

It is an arithmetic number, because the mean of its divisors is an integer number (98095203).

Almost surely, 2^261587206 is an apocalyptic number.

261587206 is a deficient number, since it is larger than the sum of its proper divisors (130793606).

261587206 is a wasteful number, since it uses less digits than its factorization.

261587206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130793605.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 261587206 is about 16173.6577804775. The cubic root of 261587206 is about 639.5465586946.

The spelling of 261587206 in words is "two hundred sixty-one million, five hundred eighty-seven thousand, two hundred six".