261487967 has 4 divisors (see below), whose sum is σ = 281602440. Its totient is φ = 241373496.

The previous prime is 261487957. The next prime is 261487981. The reversal of 261487967 is 769784162.

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

It is not a de Polignac number, because 261487967 - 2⁴ = 261487951 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 (261487957) 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, 10057217 + ... + 10057242.

It is an arithmetic number, because the mean of its divisors is an integer number (70400610).

Almost surely, 2^261487967 is an apocalyptic number.

261487967 is a deficient number, since it is larger than the sum of its proper divisors (20114473).

261487967 is a wasteful number, since it uses less digits than its factorization.

261487967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20114472.

The product of its digits is 1016064, while the sum is 50.

The square root of 261487967 is about 16170.5895687201. The cubic root of 261487967 is about 639.4656729999.

The spelling of 261487967 in words is "two hundred sixty-one million, four hundred eighty-seven thousand, nine hundred sixty-seven".