261497347 has 8 divisors (see below), whose sum is σ = 265305600. Its totient is φ = 257701704.

The previous prime is 261497339. The next prime is 261497351. The reversal of 261497347 is 743794162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261497347 - 2³ = 261497339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261497317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43554 + ... + 49192.

It is an arithmetic number, because the mean of its divisors is an integer number (33163200).

Almost surely, 2^261497347 is an apocalyptic number.

261497347 is a deficient number, since it is larger than the sum of its proper divisors (3808253).

261497347 is an equidigital number, since it uses as much as digits as its factorization.

261497347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6305.

The product of its digits is 254016, while the sum is 43.

The square root of 261497347 is about 16170.8795988344. The cubic root of 261497347 is about 639.4733191342.

The spelling of 261497347 in words is "two hundred sixty-one million, four hundred ninety-seven thousand, three hundred forty-seven".