261036071 has 12 divisors (see below), whose sum is σ = 278805120. Its totient is φ = 244343040.

The previous prime is 261036043. The next prime is 261036091. The reversal of 261036071 is 170630162.

It is not a de Polignac number, because 261036071 - 2²⁶ = 193927207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261036071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261036011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52835 + ... + 57563.

It is an arithmetic number, because the mean of its divisors is an integer number (23233760).

Almost surely, 2^261036071 is an apocalyptic number.

261036071 is a deficient number, since it is larger than the sum of its proper divisors (17769049).

261036071 is a wasteful number, since it uses less digits than its factorization.

261036071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4954 (or 4937 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 261036071 is about 16156.6107522587. The cubic root of 261036071 is about 639.0970918533.

The spelling of 261036071 in words is "two hundred sixty-one million, thirty-six thousand, seventy-one".