261264061 has 16 divisors (see below), whose sum is σ = 276401664. Its totient is φ = 246471984.

The previous prime is 261264053. The next prime is 261264077. The reversal of 261264061 is 160462162.

It is a cyclic number.

It is not a de Polignac number, because 261264061 - 2³ = 261264053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261262061) 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, 850870 + ... + 851176.

It is an arithmetic number, because the mean of its divisors is an integer number (17275104).

Almost surely, 2^261264061 is an apocalyptic number.

It is an amenable number.

261264061 is a deficient number, since it is larger than the sum of its proper divisors (15137603).

261264061 is a wasteful number, since it uses less digits than its factorization.

261264061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 261264061 is about 16163.6648381486. The cubic root of 261264061 is about 639.2831010708.

The spelling of 261264061 in words is "two hundred sixty-one million, two hundred sixty-four thousand, sixty-one".