261564982 has 16 divisors (see below), whose sum is σ = 471997440. Its totient is φ = 106199208.

The previous prime is 261564973. The next prime is 261564997. The reversal of 261564982 is 289465162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491398 + ... + 491929.

It is an arithmetic number, because the mean of its divisors is an integer number (29499840).

Almost surely, 2^261564982 is an apocalyptic number.

261564982 is a deficient number, since it is larger than the sum of its proper divisors (210432458).

261564982 is a wasteful number, since it uses less digits than its factorization.

261564982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 983355.

The product of its digits is 207360, while the sum is 43.

The square root of 261564982 is about 16172.9707227831. The cubic root of 261564982 is about 639.5284465891.

The spelling of 261564982 in words is "two hundred sixty-one million, five hundred sixty-four thousand, nine hundred eighty-two".