261374479 has 4 divisors (see below), whose sum is σ = 263772520. Its totient is φ = 258976440.

The previous prime is 261374471. The next prime is 261374489. The reversal of 261374479 is 974473162.

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 261374479 - 2³ = 261374471 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 (261374471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1198857 + ... + 1199074.

It is an arithmetic number, because the mean of its divisors is an integer number (65943130).

Almost surely, 2^261374479 is an apocalyptic number.

261374479 is a deficient number, since it is larger than the sum of its proper divisors (2398041).

261374479 is a wasteful number, since it uses less digits than its factorization.

261374479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2398040.

The product of its digits is 254016, while the sum is 43.

The square root of 261374479 is about 16167.0801012428. The cubic root of 261374479 is about 639.3731484342.

The spelling of 261374479 in words is "two hundred sixty-one million, three hundred seventy-four thousand, four hundred seventy-nine".