261360197 has 4 divisors (see below), whose sum is σ = 298697376. Its totient is φ = 224023020.

The previous prime is 261360137. The next prime is 261360217. The reversal of 261360197 is 791063162.

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, and also an emirpimes, since its reverse is a distinct semiprime: 791063162 = 2 ⋅395531581.

It is a cyclic number.

It is not a de Polignac number, because 261360197 - 2⁶ = 261360133 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 (261360137) 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, 18668579 + ... + 18668592.

It is an arithmetic number, because the mean of its divisors is an integer number (74674344).

Almost surely, 2^261360197 is an apocalyptic number.

It is an amenable number.

261360197 is a deficient number, since it is larger than the sum of its proper divisors (37337179).

261360197 is an equidigital number, since it uses as much as digits as its factorization.

261360197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37337178.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 261360197 is about 16166.6383951643. The cubic root of 261360197 is about 639.3615026994.

The spelling of 261360197 in words is "two hundred sixty-one million, three hundred sixty thousand, one hundred ninety-seven".