261357 has 4 divisors (see below), whose sum is σ = 348480. Its totient is φ = 174236.

The previous prime is 261353. The next prime is 261379. The reversal of 261357 is 753162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261357 - 2² = 261353 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261353) 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, 43557 + ... + 43562.

It is an arithmetic number, because the mean of its divisors is an integer number (87120).

2²⁶¹³⁵⁷ is an apocalyptic number.

It is an amenable number.

261357 is a deficient number, since it is larger than the sum of its proper divisors (87123).

261357 is an equidigital number, since it uses as much as digits as its factorization.

261357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87122.

The product of its digits is 1260, while the sum is 24.

The square root of 261357 is about 511.2308676127. The cubic root of 261357 is about 63.9358895764.

The spelling of 261357 in words is "two hundred sixty-one thousand, three hundred fifty-seven".