261344534 has 32 divisors (see below), whose sum is σ = 439312896. Its totient is φ = 115585120.

The previous prime is 261344521. The next prime is 261344543. The reversal of 261344534 is 435443162.

It is a self number, because there is not a number n which added to its sum of digits gives 261344534.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203057 + ... + 204339.

It is an arithmetic number, because the mean of its divisors is an integer number (13728528).

Almost surely, 2^261344534 is an apocalyptic number.

261344534 is a deficient number, since it is larger than the sum of its proper divisors (177968362).

261344534 is a wasteful number, since it uses less digits than its factorization.

261344534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540.

The product of its digits is 34560, while the sum is 32.

The square root of 261344534 is about 16166.1539643788. The cubic root of 261344534 is about 639.3487303908.

Adding to 261344534 its reverse (435443162), we get a palindrome (696787696).

The spelling of 261344534 in words is "two hundred sixty-one million, three hundred forty-four thousand, five hundred thirty-four".