261012547 has 4 divisors (see below), whose sum is σ = 263703496. Its totient is φ = 258321600.

The previous prime is 261012527. The next prime is 261012569. The reversal of 261012547 is 745210162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261012547 - 2⁷ = 261012419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261012517) 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, 1345329 + ... + 1345522.

It is an arithmetic number, because the mean of its divisors is an integer number (65925874).

Almost surely, 2^261012547 is an apocalyptic number.

261012547 is a deficient number, since it is larger than the sum of its proper divisors (2690949).

261012547 is an equidigital number, since it uses as much as digits as its factorization.

261012547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2690948.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 261012547 is about 16155.8827366381. The cubic root of 261012547 is about 639.0778932657.

The spelling of 261012547 in words is "two hundred sixty-one million, twelve thousand, five hundred forty-seven".