261556324 has 6 divisors (see below), whose sum is σ = 457723574. Its totient is φ = 130778160.

The previous prime is 261556301. The next prime is 261556327. The reversal of 261556324 is 423655162.

It can be written as a sum of positive squares in only one way, i.e., 261404224 + 152100 = 16168^2 + 390^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261556324.

It is not an unprimeable number, because it can be changed into a prime (261556327) 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, 32694537 + ... + 32694544.

Almost surely, 2^261556324 is an apocalyptic number.

It is an amenable number.

261556324 is a deficient number, since it is larger than the sum of its proper divisors (196167250).

261556324 is a wasteful number, since it uses less digits than its factorization.

261556324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65389085 (or 65389083 counting only the distinct ones).

The product of its digits is 43200, while the sum is 34.

The square root of 261556324 is about 16172.7030517474. The cubic root of 261556324 is about 639.5213902184.

The spelling of 261556324 in words is "two hundred sixty-one million, five hundred fifty-six thousand, three hundred twenty-four".