613532261 has 24 divisors (see below), whose sum is σ = 675181416. Its totient is φ = 556968960.

The previous prime is 613532251. The next prime is 613532273. The reversal of 613532261 is 162235316.

It can be written as a sum of positive squares in 12 ways, for example, as 132388036 + 481144225 = 11506^2 + 21935^2 .

It is not a de Polignac number, because 613532261 - 2⁶ = 613532197 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 (613532221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1935275 + ... + 1935591.

It is an arithmetic number, because the mean of its divisors is an integer number (28132559).

Almost surely, 2^613532261 is an apocalyptic number.

It is an amenable number.

613532261 is a deficient number, since it is larger than the sum of its proper divisors (61649155).

613532261 is a wasteful number, since it uses less digits than its factorization.

613532261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 552 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 613532261 is about 24769.5833836583. The cubic root of 613532261 is about 849.7264453049.

Adding to 613532261 its reverse (162235316), we get a palindrome (775767577).

The spelling of 613532261 in words is "six hundred thirteen million, five hundred thirty-two thousand, two hundred sixty-one".