261097 has 4 divisors (see below), whose sum is σ = 262656. Its totient is φ = 259540.

The previous prime is 261089. The next prime is 261101. The reversal of 261097 is 790162.

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 261097 - 2³ = 261089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261017) 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, 493 + ... + 874.

It is an arithmetic number, because the mean of its divisors is an integer number (65664).

2²⁶¹⁰⁹⁷ is an apocalyptic number.

It is an amenable number.

261097 is a deficient number, since it is larger than the sum of its proper divisors (1559).

261097 is a wasteful number, since it uses less digits than its factorization.

261097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1558.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 261097 is about 510.9765160944. The cubic root of 261097 is about 63.9146812335.

The spelling of 261097 in words is "two hundred sixty-one thousand, ninety-seven".