571201261 has 4 divisors (see below), whose sum is σ = 573424092. Its totient is φ = 568978432.

The previous prime is 571201259. The next prime is 571201277. The reversal of 571201261 is 162102175.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 327248100 + 243953161 = 18090^2 + 15619^2 .

It is a cyclic number.

It is not a de Polignac number, because 571201261 - 2¹ = 571201259 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 (571201201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1111030 + ... + 1111543.

It is an arithmetic number, because the mean of its divisors is an integer number (143356023).

Almost surely, 2^571201261 is an apocalyptic number.

It is an amenable number.

571201261 is a deficient number, since it is larger than the sum of its proper divisors (2222831).

571201261 is a wasteful number, since it uses less digits than its factorization.

571201261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222830.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 571201261 is about 23899.8171750330. The cubic root of 571201261 is about 829.7164856417.

The spelling of 571201261 in words is "five hundred seventy-one million, two hundred one thousand, two hundred sixty-one".