261308797 has 4 divisors (see below), whose sum is σ = 261352960. Its totient is φ = 261264636.

The previous prime is 261308791. The next prime is 261308809. The reversal of 261308797 is 797803162.

It is a happy number.

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 261308797 - 2¹⁹ = 260784509 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 (261308791) 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, 11523 + ... + 25600.

It is an arithmetic number, because the mean of its divisors is an integer number (65338240).

Almost surely, 2^261308797 is an apocalyptic number.

It is an amenable number.

261308797 is a deficient number, since it is larger than the sum of its proper divisors (44163).

261308797 is an equidigital number, since it uses as much as digits as its factorization.

261308797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44162.

The product of its (nonzero) digits is 127008, while the sum is 43.

The square root of 261308797 is about 16165.0486234963. The cubic root of 261308797 is about 639.3195869369.

The spelling of 261308797 in words is "two hundred sixty-one million, three hundred eight thousand, seven hundred ninety-seven".