261347603 has 16 divisors (see below), whose sum is σ = 301056000. Its totient is φ = 224376480.

The previous prime is 261347599. The next prime is 261347609. The reversal of 261347603 is 306743162.

It is a cyclic number.

It is not a de Polignac number, because 261347603 - 2² = 261347599 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261347603.

It is not an unprimeable number, because it can be changed into a prime (261347609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71150 + ... + 74732.

It is an arithmetic number, because the mean of its divisors is an integer number (18816000).

Almost surely, 2^261347603 is an apocalyptic number.

261347603 is a deficient number, since it is larger than the sum of its proper divisors (39708397).

261347603 is a wasteful number, since it uses less digits than its factorization.

261347603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3962.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 261347603 is about 16166.2488846362. The cubic root of 261347603 is about 639.3512330304.

The spelling of 261347603 in words is "two hundred sixty-one million, three hundred forty-seven thousand, six hundred three".