261370611 has 8 divisors (see below), whose sum is σ = 387215760. Its totient is φ = 174247056.

The previous prime is 261370607. The next prime is 261370633. The reversal of 261370611 is 116073162.

It is not a de Polignac number, because 261370611 - 2² = 261370607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 9680393 = 261370611 / (2 + 6 + 1 + 3 + 7 + 0 + 6 + 1 + 1).

It is not an unprimeable number, because it can be changed into a prime (261370651) 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, 4840170 + ... + 4840223.

It is an arithmetic number, because the mean of its divisors is an integer number (48401970).

Almost surely, 2^261370611 is an apocalyptic number.

261370611 is a deficient number, since it is larger than the sum of its proper divisors (125845149).

261370611 is an equidigital number, since it uses as much as digits as its factorization.

261370611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9680402 (or 9680396 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 261370611 is about 16166.9604749934. The cubic root of 261370611 is about 639.3699944569.

The spelling of 261370611 in words is "two hundred sixty-one million, three hundred seventy thousand, six hundred eleven".