261560537 has 16 divisors (see below), whose sum is σ = 304041600. Its totient is φ = 220391808.

The previous prime is 261560527. The next prime is 261560543. The reversal of 261560537 is 735065162.

It is not a de Polignac number, because 261560537 - 2⁸ = 261560281 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261560497 and 261560506.

It is not an unprimeable number, because it can be changed into a prime (261560527) 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, 101339 + ... + 103887.

It is an arithmetic number, because the mean of its divisors is an integer number (19002600).

Almost surely, 2^261560537 is an apocalyptic number.

It is an amenable number.

261560537 is a deficient number, since it is larger than the sum of its proper divisors (42481063).

261560537 is a wasteful number, since it uses less digits than its factorization.

261560537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2800.

The product of its (nonzero) digits is 37800, while the sum is 35.

The square root of 261560537 is about 16172.8333015585. The cubic root of 261560537 is about 639.5248238818.

The spelling of 261560537 in words is "two hundred sixty-one million, five hundred sixty thousand, five hundred thirty-seven".