261147573 has 12 divisors (see below), whose sum is σ = 386414028. Its totient is φ = 169851840.

The previous prime is 261147569. The next prime is 261147577. The reversal of 261147573 is 375741162.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (261147569) and next prime (261147577).

It can be written as a sum of positive squares in 2 ways, for example, as 84603204 + 176544369 = 9198^2 + 13287^2 .

It is not a de Polignac number, because 261147573 - 2² = 261147569 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261147577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 353490 + ... + 354227.

It is an arithmetic number, because the mean of its divisors is an integer number (32201169).

Almost surely, 2^261147573 is an apocalyptic number.

It is an amenable number.

261147573 is a deficient number, since it is larger than the sum of its proper divisors (125266455).

261147573 is a wasteful number, since it uses less digits than its factorization.

261147573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707764 (or 707761 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 261147573 is about 16160.0610456768. The cubic root of 261147573 is about 639.1880760350.

The spelling of 261147573 in words is "two hundred sixty-one million, one hundred forty-seven thousand, five hundred seventy-three".