261127563 has 16 divisors (see below), whose sum is σ = 354191616. Its totient is φ = 171090080.

The previous prime is 261127561. The next prime is 261127567. The reversal of 261127563 is 365721162.

It is a cyclic number.

It is not a de Polignac number, because 261127563 - 2¹ = 261127561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261127561) 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, 72145 + ... + 75677.

It is an arithmetic number, because the mean of its divisors is an integer number (22136976).

Almost surely, 2^261127563 is an apocalyptic number.

261127563 is a deficient number, since it is larger than the sum of its proper divisors (93064053).

261127563 is a wasteful number, since it uses less digits than its factorization.

261127563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954.

The product of its digits is 15120, while the sum is 33.

The square root of 261127563 is about 16159.4419148682. The cubic root of 261127563 is about 639.1717500423.

The spelling of 261127563 in words is "two hundred sixty-one million, one hundred twenty-seven thousand, five hundred sixty-three".