261478847 has 8 divisors (see below), whose sum is σ = 304932000. Its totient is φ = 224124432.

The previous prime is 261478837. The next prime is 261478849. The reversal of 261478847 is 748874162.

It is not a de Polignac number, because 261478847 - 2⁶ = 261478783 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 (261478849) 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, 380822 + ... + 381507.

It is an arithmetic number, because the mean of its divisors is an integer number (38116500).

Almost surely, 2^261478847 is an apocalyptic number.

261478847 is a deficient number, since it is larger than the sum of its proper divisors (43453153).

261478847 is an frugal number, since it uses more digits than its factorization.

261478847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 762350 (or 762336 counting only the distinct ones).

The product of its digits is 602112, while the sum is 47.

The square root of 261478847 is about 16170.3075728324. The cubic root of 261478847 is about 639.4582386301.

The spelling of 261478847 in words is "two hundred sixty-one million, four hundred seventy-eight thousand, eight hundred forty-seven".